JP2017021144A - Translation system and translation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a translation system capable of enhancing the secrecy of contents of a document before translation and a document after translation by enabling translation from an encrypted document before translation into an encrypted document after translation.SOLUTION: Document encryption means 1 encrypts a document before translation with an encryption key. Dictionary encryption means 4 encrypts a dictionary stored in dictionary storage means 8 with an encryption key common to that encryption key. Translation means 7 translates the encrypted document before translation on the basis of the encrypted dictionary, and thereby generates a document after translation. Document decryption means 11 decrypts the document after translation with a decryption key corresponding to the encryption key.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a translation system that executes translation of a document, a translation method, and a terminal device, a server, a terminal device program, and a server program that are applied to the translation system.

  Various techniques relating to machine translation and dictionaries used in machine translation have been proposed (see, for example, Patent Documents 1 to 4).

  Patent Document 1 proposes a system including a client that can execute a translation process independently by using a client dictionary, and a dictionary server that provides dictionary information to the client. In the system described in Patent Document 1, the client requests the dictionary server to search for a headword that does not exist in the client dictionary. The dictionary server returns data including dictionary information and an encryption flag to the client. The encryption flag is a flag indicating whether dictionary information is encrypted. When the encryption flag is 0, the client copies the dictionary information as it is to the temporary dictionary. When the encryption flag is 1, the client decrypts the dictionary information with the decryption key and copies the decrypted dictionary information to the temporary dictionary. Here, the decryption key can be acquired when the user of the client makes a contract with the administrator of the dictionary server. With such a configuration, in the system described in Patent Document 1, only the user who has contracted with the administrator of the dictionary server can use the dictionary information of the dictionary server.

  Patent Document 2 describes a method of compressing dictionary index word index data used for machine translation.

  Patent Document 3 describes a translation processing system including an authentication server connected to a user terminal via a network and a translation processing server connected to the authentication server. The authentication server and the translation processing server are directly connected by a predetermined cable. In the translation processing system described in Patent Literature 3, the user terminal encrypts the original text data and transmits the encrypted original text data to the authentication server. The authentication server decrypts the encrypted original text data and transmits the decrypted original text data to the translation processing server. The translation processing server generates a translated sentence from the original sentence data and transmits it to the authentication server. The authentication server encrypts the translated sentence and transmits it to the user terminal. The user terminal decrypts the encrypted translation and displays it.

  Patent Document 4 describes an automatic translation system including a client and a server system. In the automatic translation system described in Patent Document 4, the personal computer included in the client encrypts the original text and transmits the encrypted original text to the server system. The server system decrypts the original text and executes a translation process. Further, the server system encrypts the translation and transmits it to the client. The client decrypts the encrypted translation.

JP-A-10-198680 Japanese Patent Laid-Open No. 11-143877 JP 2004-118285 A Japanese Patent Laid-Open No. 2001-034613

  Patent Documents 1 and 2 describe encrypting a document before translation processing (pre-translation document) and encrypting a document after translation processing (post-translation document). Not. In order to increase the confidentiality of the document contents, it is preferable to keep the pre-translation document and the post-translation document in an encrypted state.

  In the techniques described in Patent Documents 3 and 4, the original text is encrypted, but before the translation, the encrypted original text is decrypted and a translated text is generated from the decrypted original text. The original text before translation and the translated text after translation are not encrypted. As described above, it is preferable to keep the pre-translation document and the post-translation document encrypted in order to increase the confidentiality of the document contents.

  However, with a general technique, translation cannot be performed from an encrypted pre-translation document.

  Therefore, the present invention enables translation from an encrypted pre-translation document to an encrypted post-translation document, and can improve the confidentiality of the contents of the pre-translation document and the post-translation document. It is an object to provide a system, a translation method, and a terminal device, a server, a terminal device program, and a server program applied to the translation system.

  A translation system according to the present invention includes a document encryption unit that encrypts a pre-translation document with an encryption key, an encryption key transmission unit that transmits an encryption key, and an encryption key reception that receives the encryption key transmitted by the encryption key transmission unit. A dictionary storage means for storing a dictionary including a set of information in which means, an entry word, and a translation corresponding to the entry word are associated with each other; a dictionary encryption that encrypts the dictionary with the encryption key received by the encryption key reception means A pre-translation document transmission unit that transmits the pre-translation document encrypted by the document encryption unit, a pre-translation document reception unit that receives the pre-translation document transmitted by the pre-translation document transmission unit, and a pre-translation document Translation means for generating a post-translation document by translating the pre-translation document received by the document reception means based on the encrypted dictionary, and post-translation document transmission means for transmitting the post-translation document A translated document receiving unit that receives the translated document transmitted by the translated document transmitting unit; and a document decrypting unit that decrypts the translated document received by the translated document receiving unit with a decryption key corresponding to the encryption key; It is characterized by providing.

  The terminal device according to the present invention is a terminal device that can communicate with a server that performs translation, and includes a document encryption unit that encrypts a pre-translation document with an encryption key, and an encryption key transmission that transmits the encryption key to the server. Means, a pre-translation document transmission means for transmitting the pre-translation document encrypted by the document encryption means to the server, and a post-translation document reception means for receiving the post-translation document generated from the pre-translation document by the server. And a document decrypting means for decrypting the translated document received by the translated document receiving means with a decryption key corresponding to the encryption key.

  The server according to the present invention is a server capable of communicating with a terminal device that generates an encrypted pre-translation document, and receives from the terminal device an encryption key used when the terminal device encrypts the pre-translation document. Encrypting the dictionary with the encryption key received by the encryption key receiving means, a dictionary storage means for storing a dictionary including a set of information corresponding to the headword and the translation corresponding to the headword, and the encryption key received by the encryption key receiving means Dictionary encrypting means to be converted, pre-translation document receiving means for receiving the encrypted pre-translation document transmitted by the terminal device, and pre-translation document received by the pre-translation document receiving means to the encrypted dictionary Translation means for generating a post-translation document by translating on the basis, and post-translation document transmission means for transmitting the post-translation document to the terminal device are provided.

  In the translation method according to the present invention, the document encryption unit encrypts the pre-translation document with the encryption key, the encryption key transmission unit transmits the encryption key, and the encryption key reception unit is transmitted by the encryption key transmission unit. And the dictionary encryption means encrypts a dictionary including a set of information in which the headword and the translation corresponding to the headword are associated with the encryption key received by the encryption key receiving means, The pre-translation document transmission unit transmits the pre-translation document encrypted by the document encryption unit, the pre-translation document reception unit receives the pre-translation document transmitted by the pre-translation document transmission unit, and the translation unit includes: By translating the pre-translation document received by the pre-translation document receiving unit based on the encrypted dictionary, the post-translation document is generated, and the post-translation document transmission unit transmits the post-translation document, and the post-translation document The receiving means Receiving the post-translational document transmitted by translation after the document transmitting unit, the document decoding means, post-translational document posttranslational document received by the receiving means, wherein the decrypting by the decryption key corresponding to the encryption key.

  The terminal device program according to the present invention is a terminal device program mounted on a computer that can communicate with a server that performs translation, and the computer encrypts a document before translation with an encryption key. , Encryption key transmission processing for transmitting the encryption key to the server, pre-translation document transmission processing for transmitting the pre-translation document encrypted by the document encryption processing to the server, and the post-translation document generated from the pre-translation document by the server And a document decrypting process for decrypting the translated document received in the translated document receiving process with the decryption key corresponding to the encryption key.

  The server program according to the present invention is a computer that can communicate with a terminal device that generates an encrypted pre-translation document, and is a set of information in which a headword and a translation corresponding to the headword are associated with each other A server program installed in a computer having a dictionary storage means for storing a dictionary including the encryption key for receiving from the terminal device an encryption key used when the terminal device encrypts the pre-translation document Reception processing, dictionary encryption processing for encrypting the dictionary with the encryption key received in the encryption key reception processing, pre-translation document reception processing for receiving the pre-translation document transmitted by the terminal device, pre-translation document reception processing Translating the pre-translation document received in step 2 based on the encrypted dictionary to generate a post-translation document and sending the post-translation document to the terminal device Possible to execute the post-translational document transmission process to be characterized.

  According to the present invention, it is possible to translate an encrypted pre-translation document into an encrypted post-translation document, and improve the confidentiality of the contents of the pre-translation document and the post-translation document.

It is a block diagram which shows an example of embodiment of the translation system of this invention. It is a schematic diagram which shows the example of the dictionary before encryption. It is a schematic diagram which shows the example of the result of having encrypted the dictionary illustrated in FIG. It is a flowchart which shows the example of a process progress until it will be in the state which transmits the pre-translation document to the pre-translation document transmission means. It is a flowchart which shows the example of the process progress after encrypting a document before translation until it decrypts a document after translation. It is explanatory drawing which shows the example of the change of the content of the document by encryption, translation, and a decoding. It is a block diagram which shows the outline | summary of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a document before translation processing is referred to as a pre-translation document. A document after the translation processing is executed is referred to as a post-translation document.

  FIG. 1 is a block diagram showing an example of an embodiment of a translation system of the present invention. FIG. 1 illustrates a case where the translation system includes a terminal device 21 used by a user and a server 22 that can communicate with the terminal device 21. Hereinafter, the translation system of the present invention will be described with reference to FIG. However, as will be described later, the translation system of the present invention is not limited to the configuration including the terminal device 21 and the server 22.

  The terminal device 21 and the server 22 are connected via a communication network (not shown), for example, and can communicate with each other.

  The terminal device 21 includes a document encryption unit 1, an encryption key transmission unit 2, a pre-translation document transmission unit 5, a post-translation document reception unit 10, and a document decryption unit 11.

  The server 22 includes encryption key receiving means 3, dictionary encryption means 4, pre-translation document receiving means 6, translation means 7, dictionary storage means 8, and post-translation document transmission means 9.

  The document encryption unit 1 encrypts the pre-translation document with an encryption key. For example, the document encryption unit 1 may encrypt the pre-translation document by the RSA encryption method, but may encrypt the pre-translation document by a method other than the RSA encryption method. However, the document encryption unit 1 encrypts the pre-translation document using a public key cryptosystem. In the public key cryptosystem, the encryption key and the decryption key are different, the encryption key is referred to as a public key, and the decryption key is referred to as a secret key.

  The document encryption unit 1 generates a public key and a secret key corresponding to the public key. This secret key is used by the document decryption means 11.

  The encryption key transmission unit 2 transmits to the encryption key reception unit 3 an encryption key (hereinafter referred to as a public key) used when the document encryption unit 1 encrypts the pre-translation document.

  The encryption key receiving unit 3 receives the public key transmitted by the encryption key transmitting unit 2.

  The dictionary storage unit 8 is a storage device that stores a dictionary. The dictionary includes a set of information in which an entry word is associated with a translation corresponding to the entry word. In the initial state, the dictionary is not encrypted.

  The dictionary encryption unit 4 encrypts the dictionary stored in the dictionary storage unit 8 with the public key received by the encryption key receiving unit 3. That is, the dictionary encryption unit 4 encrypts the dictionary with a public key that is the same as the public key used when the document encryption unit 1 encrypts the document before translation. Specifically, the dictionary encryption means 4 encrypts each entry word and each translation word included in the dictionary with a public key.

  FIG. 2 is a schematic diagram illustrating an example of a dictionary before encryption. In the example shown in FIG. 2, the corresponding headwords and translations are shown side by side in each row. This also applies to FIG. 3 described later. In FIG. 2, three pairs of headwords and translated words are illustrated, but the number of pairs of headwords and translated words included in the dictionary is not limited to three.

  FIG. 3 is a schematic diagram showing an example of a result obtained when the dictionary encryption unit 4 encrypts the dictionary illustrated in FIG. The headwords and translations in each row shown in FIG. 3 are examples of the result of encrypting the headwords and translations in each row shown in FIG. Here, the result of encrypting the Japanese headword “cat” shown in FIG. 2 is “1011275”, and the result of encrypting the translated word “cat” corresponding to “cat” is “6845”. The case etc. are illustrated.

  The pre-translation document transmission unit 5 transmits the pre-translation document encrypted by the document encryption unit 1 to the pre-translation document reception unit 6. However, the pre-translation document transmission unit 5 transmits the encrypted pre-translation document on condition that the dictionary encryption unit 4 has completed encryption of the dictionary. If dictionary encryption by the dictionary encryption unit 4 has not been completed, the pre-translation document transmission unit 5 does not transmit the pre-translation document even if an encrypted pre-translation document exists. Wait until dictionary encryption is complete.

  The pre-translation document receiving unit 6 receives the pre-translation document transmitted by the pre-translation document transmission unit 5.

  The translation unit 7 generates a post-translation document by machine-translating the pre-translation document received by the pre-translation document reception unit 6. At this time, the translation means 7 performs machine translation of the pre-translation document with reference to the encrypted dictionary.

  The machine translation algorithm by the translation means 7 may be a general machine translation algorithm. However, the pre-translation document is in an encrypted state, and each headword and each translated word included in the dictionary are also encrypted. Therefore, the post-translation document obtained by the translation means 7 machine-translating the pre-translation document is also in an encrypted state.

  The post-translation document transmission unit 9 transmits the post-translation document generated by the translation unit 7 to the post-translation document reception unit 10.

  The translated document receiving unit 10 receives the translated document transmitted by the translated document transmitting unit 9.

  The document decryption unit 11 decrypts the post-translation document received by the post-translation document reception unit 10 with a secret key corresponding to the public key used when the document encryption unit 1 encrypts the pre-translation document.

  The document encryption unit 1, the encryption key transmission unit 2, the pre-translation document transmission unit 5, the post-translation document reception unit 10, and the document decryption unit 11 included in the terminal device 21 are, for example, a computer that operates according to the terminal device program. It is realized by a processor (for example, CPU). In this case, for example, the processor of the terminal device 21 reads the terminal device program from a program recording medium such as a program storage device (not shown) of the terminal device 21, and the document encryption unit 1, The encryption key transmission unit 2, the pre-translation document transmission unit 5, the post-translation document reception unit 10, and the document decryption unit 11 may be operated.

  Similarly, the encryption key receiving means 3, the dictionary encryption means 4, the pre-translation document reception means 6, the translation means 7, and the post-translation document transmission means 9 included in the server 22 are, for example, a computer that operates according to a server program. It is realized by a processor (for example, CPU). In this case, for example, the processor of the server 22 reads the server program from a program recording medium such as a program storage device (not shown) of the server 22 and, according to the server program, the encryption key receiving unit 3 and the dictionary encryption unit. 4. It only has to operate as the pre-translation document reception means 6, the translation means 7, and the post-translation document transmission means 9.

  In addition, for example, the document encryption unit 1, the encryption key transmission unit 2, the pre-translation document transmission unit 5, the post-translation document reception unit 10, and the document decryption unit 11 included in the terminal device 21 include at least one integrated circuit. It may be realized by. An example of such an integrated circuit is a microchip. In the terminal device 21, the document encryption unit 1, the encryption key transmission unit 2, the pre-translation document transmission unit 5, the post-translation document reception unit 10, and the document decryption unit 11 may be realized by separate integrated circuits.

  Similarly, the encryption key receiving unit 3, the dictionary encryption unit 4, the pre-translation document receiving unit 6, the translation unit 7, and the post-translation document transmission unit 9 included in the server 22 are realized by at least one integrated circuit. It may be. As described above, a microchip is an example of such an integrated circuit. In the server 22, the encryption key receiving unit 3, the dictionary encryption unit 4, the pre-translation document reception unit 6, the translation unit 7, and the post-translation document transmission unit 9 may be realized by separate integrated circuits.

  Next, the processing progress of the present invention will be described.

  FIG. 4 is a flowchart showing an example of the processing progress until the pre-translation document transmission means 5 enters a state of transmitting the encrypted pre-translation document.

  In the terminal device 21, the document encryption unit 1 generates an encryption key (public key), and passes the public key to the encryption key transmission unit 2 (step S1). In step S 1, when the document encryption unit 1 generates a public key, the document encryption unit 1 also generates a secret key corresponding to the public key, and passes the secret key to the document decryption unit 11. The secret key is a decryption key for decrypting a document encrypted with the public key.

  The encryption key transmission unit 2 of the terminal device 21 transmits the encryption key (public key) generated in step S1 to the encryption key reception unit 3 of the server 22, and the encryption key reception unit 3 receives the public key. (Step S2). The encryption key receiving unit 3 passes the public key to the dictionary encryption unit 4.

  The dictionary encryption unit 4 encrypts the dictionary stored in the dictionary storage unit 8 using the public key (step S3). Specifically, the dictionary encryption means 4 encrypts each entry word and each translation word included in the dictionary with a public key.

  Further, the dictionary encryption means 4 determines whether or not dictionary encryption has been completed (step S4).

  If the dictionary encryption has not been completed (No in step S4), the dictionary encryption unit 4 outputs a standby notification instructing to wait for transmission of the encrypted pre-translation document (step S5). Specifically, the dictionary encryption unit 4 sends a standby notification to the pre-translation document transmission unit 5 of the terminal device 21 via the post-translation document transmission unit 9 and the post-translation document reception unit 10. Until the dictionary encryption is completed, the dictionary encryption unit 4 repeats the processes of steps S4 and S5.

  When dictionary encryption is completed (Yes in step S4), the dictionary encryption unit 4 outputs a standby release notification instructing cancellation of transmission standby of the encrypted pre-translation document (step S6). Specifically, the dictionary encryption unit 4 sends a standby release notification to the pre-translation document transmission unit 5 of the terminal device 21 via the post-translation document transmission unit 9 and the post-translation document reception unit 10.

  While the pre-translation document transmission unit 5 receives the standby notification, even if the pre-translation document encrypted by the document encryption unit 1 exists, the pre-translation document transmission unit 5 encrypts the pre-translation document according to the standby notification. It waits without transmitting to the key receiving means 3. When the pre-translation document transmission unit 5 receives the standby release notification, the pre-translation document transmission unit 5 releases the standby state according to the standby cancellation notification, and transmits the encrypted pre-translation document to the encryption key reception unit 3 of the server 22. Therefore, the pre-translation document transmission unit 5 transmits the encrypted pre-translation document on the condition that the dictionary encryption unit 4 has completed encryption of the dictionary.

  FIG. 5 is a flowchart showing an example of the progress of processing from encrypting the pre-translation document to decrypting the post-translation document. FIG. 6 is an explanatory diagram showing an example of changes in the contents of a document due to encryption, translation, and decryption. Hereinafter, in order to simplify the explanation, it is assumed that the dictionary before encryption includes a set of headwords and translations shown in FIG. Also, assume that the dictionary encryption unit 4 encrypts each entry word and each translation word shown in FIG. 2 to obtain the combination of the entry word and translation word shown in FIG.

  For example, when the pre-translation document is input by the user, the document encryption unit 1 of the terminal device 21 encrypts the pre-translation document and passes it to the pre-translation document transmission unit 5 (step S11). At this time, the document encryption unit 1 encrypts the pre-translation document with the public key generated in step S1 (see FIG. 4).

  Therefore, the public key used when the dictionary encryption unit 4 encrypts the dictionary and the public key used when the document encryption unit 1 encrypts the pre-translation document are common.

  In order to simplify the explanation, it is assumed that the content of the document before translation input to the document encryption means 1 is “Cat and Dog” in Japanese. If the dictionary encryption means 4 encrypts each headword and each translation word shown in FIG. 2 with the public key, the combination of the headword and translation word shown in FIG. 3 is obtained. If the document encryption means 1 encrypts “Cat and Dog” with the public key, the encryption result (encrypted pre-translation document) is “1011275 9978521 3987541” (see FIG. 6).

  When the pre-translation document transmission unit 5 receives the encrypted pre-translation document from the document encryption unit 1, the pre-translation document transmission unit 5 determines whether or not a standby release notification has been received (step S12). If the standby release notification has not been received (No in step S12), the pre-translation document transmission unit 5 is in a state of receiving the standby notification, and the encrypted pre-translation document is stored in the server 22 until the standby release notification is received. It waits without transmitting to the encryption key receiving means 3.

  When the standby release notification is received (Yes in step S12), the pre-translation document transmission means 5 cancels the standby for transmission of the encrypted pre-translation document, and the encrypted pre-translation document (in this example, “1011275 9978521”). 3987541 ") is transmitted to the encryption key receiving means 3 of the server 22, and the encryption key receiving means 3 receives the pre-translation document (step S13). The encryption key receiving unit 3 passes the received pre-translation document to the translation unit 7.

  The fact that the pre-translation document transmission means 5 has received the standby release notification means that the dictionary encryption means 4 has already completed encryption of the dictionary.

  The translation unit 7 generates a post-translation document by translating the pre-translation document (encrypted pre-translation document) passed from the encryption key receiving unit 3 based on the dictionary that has been encrypted (Step S1). S14). The translation unit 7 passes the translated document to the translated document transmission unit 9.

  In this example, the translation means 7 translates the encrypted pre-translation document “1011275 9978521 3987541” using an encrypted dictionary as shown in FIG. If there is a portion corresponding to the encrypted headword in the pre-translation document, the translation unit 7 replaces the portion with the encrypted translation corresponding to the headword. As a result, the translation unit 7 generates “6845 6953241 98778” as the translated document (see FIG. 6).

  The translated document “6845 6953241 98778” generated in step S14 is in an encrypted state.

  The post-translation document transmission unit 9 transmits the encrypted post-translation document passed from the translation unit 7 to the post-translation document reception unit 10 of the terminal device 21, and the post-translation document reception unit 10 The translated document is received (step S15). The translated document receiving unit 10 passes the translated document to the document decrypting unit 11.

  The document decryption unit 11 decrypts the post-translation document passed from the post-translation document reception unit 10 using the secret key corresponding to the public key generated in step S1 (step S16). The post-translation document received from the post-translation document receiving means 10 is a result of translating the pre-translation document encrypted using the public key generated in step S1 based on the dictionary encrypted using the public key. It is the obtained document. Therefore, the document decryption unit 11 can decrypt the post-translation document passed from the post-translation document reception unit 10 with the secret key corresponding to the public key generated in step S1. The document decryption unit 11 decrypts the translated document “6845 6953241 98778” in an encrypted state with the above private key, thereby obtaining a translated document “cat and dog” (see FIG. 6). As a result, the user of the terminal device 21 can know the contents of the translated document (in this example, “cat and dog”).

  According to the present embodiment, after the pre-translation document is encrypted by the document encryption means 1 of the terminal device 21, the pre-translation document is translated while being encrypted. As a result, the encrypted translation is performed. Later document is obtained. Then, the document decryption means 11 of the terminal device 21 decrypts the translated document with the secret key. Therefore, it is not necessary to issue the secret key outside the terminal device 21.

  In addition, after the pre-translation document is encrypted and before the post-translation document is decrypted, both the pre-translation document and the post-translation document are encrypted. Therefore, the confidentiality of the contents of the pre-translation document and the post-translation document can be enhanced. For example, since the server 22 does not decrypt the encrypted pre-translation document, the decrypted pre-translation document does not leak from the server 22. Further, the translation unit 7 of the server 22 generates a post-translation document in an encrypted state, and the post-translation document is in an encrypted state until it is decrypted by the document decryption unit 11 of the terminal device 21. ing. Therefore, the decrypted translated document is not leaked from the server 22.

  In addition, since the original document cannot be restored from the encrypted dictionary, the confidentiality of the document can be improved.

  In the present invention, when translation is performed, the pre-translation document and the dictionary (specifically, each headword and each translated word) are each encrypted with a common public key. The previous document can be translated into an encrypted post-translation document.

  Further, the pre-translation document transmission unit 5 transmits the encrypted pre-translation document on the condition that the dictionary encryption unit 4 has completed encryption of the dictionary. Therefore, it is possible to prevent the encrypted pre-translation document from being executed in a state where the dictionary encryption has not been completed.

  The encryption key used for encrypting the pre-translation document and dictionary is a public key. Therefore, even if the public key is acquired by a third party, there is no possibility that the pre-translation document or the post-translation document will be decrypted by the third party.

  When correcting the public key exchanged via the communication path, the dictionary storage means 8 stores an initial state dictionary (non-encrypted dictionary), and then steps S1 to S6. If the process is executed, the encryption process in step S11 can be executed with the new public key, and the processes after step S11 can be executed.

  In the above embodiment, as shown in FIG. 1, the translation system includes the terminal device 21 and the server 22, and the terminal device 21 includes the document encryption unit 1 and the like, and the server 22 includes the dictionary encryption unit 4 and the like. As an example, the description has been given. The present invention is not limited to the example shown in FIG.

  For example, document encryption means 1, encryption key transmission means 2, encryption key reception means 3, dictionary storage means 8, dictionary encryption means 4, pre-translation document transmission means 5, pre-translation document reception means 6, translation means 7, translation The post-document transmission unit 9, the post-translation document reception unit 10, and the document decryption unit 11 may be provided in one server, and the server may be used on the network.

  Even in this case, the document encryption unit 1, the encryption key transmission unit 2, the encryption key reception unit 3, the dictionary encryption unit 4, the pre-translation document transmission unit 5, the pre-translation document reception unit 6, the translation unit 7, and the post-translation document The transmission unit 9, the translated document reception unit 10, and the document decoding unit 11 are realized by a processor (for example, CPU) of a computer that operates according to the translation program. In this case, the processor of the server reads the translation program from a program recording medium such as a program storage device (not shown) of the server, for example, and in accordance with the program, the document encryption unit 1, the encryption key transmission unit 2, the encryption key Operate as receiving means 3, dictionary encryption means 4, pre-translation document transmission means 5, pre-translation document reception means 6, translation means 7, post-translation document transmission means 9, post-translation document reception means 10, and document decryption means 11. That's fine.

  In the present invention, document encryption means 1, encryption key transmission means 2, encryption key reception means 3, dictionary encryption means 4, pre-translation document transmission means 5, pre-translation document reception means 6, translation means 7, and post-translation document transmission It can be said that the means 9, the translated document receiving means 10, and the document decoding means 11 may be realized by at least one or more processors that operate according to a program.

  Also, for example, document encryption means 1, encryption key transmission means 2, encryption key reception means 3, dictionary encryption means 4, pre-translation document transmission means 5, pre-translation document reception means 6, and translation included in one server The means 7, the translated document transmitting means 9, the translated document receiving means 10, and the document decoding means 11 may be realized by at least one or more integrated circuits. An example of such an integrated circuit is a microchip. Each of these means may be realized by separate integrated circuits.

  Document encryption means 1, encryption key transmission means 2, encryption key reception means 3, dictionary storage means 8, dictionary encryption means 4, pre-translation document transmission means 5, pre-translation document reception means 6, translation means 7, post-translation document The transmission unit 9, the translated document reception unit 10, and the document decoding unit 11 may be independent devices and may be arranged in a distributed manner on the network. In this case, for example, a proxy server (not shown) may operate as the document encryption unit 1 and a terminal device used by an individual may operate as the document decryption unit 11. Alternatively, the document decryption unit 11 may generate a public key and a secret key, and pass the public key to the document encryption unit 1 and the encryption key transmission unit 2.

  Next, the outline of the present invention will be described. FIG. 7 is a block diagram showing an outline of the present invention. The translation system of the present invention includes a document encryption unit 1, an encryption key transmission unit 2, an encryption key reception unit 3, a dictionary storage unit 8, a dictionary encryption unit 4, a pre-translation document transmission unit 5, a translation A pre-document receiving unit 6, a translating unit 7, a post-translation document transmitting unit 9, a post-translation document receiving unit 10, and a document decoding unit 11 are provided.

  The document encryption unit 1 encrypts the pre-translation document with an encryption key.

  The encryption key transmission unit 2 transmits the encryption key. The encryption key receiving unit 3 receives the encryption key transmitted by the encryption key transmitting unit 2.

  The dictionary storage unit 8 stores a dictionary including a set of information in which a headword is associated with a translation corresponding to the headword. The dictionary encryption unit 4 encrypts the dictionary with the encryption key received by the encryption key receiving unit 3.

  The pre-translation document transmission unit 5 transmits the pre-translation document encrypted by the document encryption unit 1. The pre-translation document receiving unit 6 receives the pre-translation document transmitted by the pre-translation document transmission unit 5.

  The translation unit 7 generates a post-translation document by translating the pre-translation document received by the pre-translation document reception unit 6 based on the encrypted dictionary.

  The translated document transmission means 9 transmits the translated document. The translated document receiving unit 10 receives the translated document transmitted by the translated document transmitting unit 9.

  The document decryption unit 11 decrypts the translated document received by the translated document receiving unit 10 with a decryption key corresponding to the encryption key.

  With such a configuration, it is possible to translate an encrypted pre-translation document into an encrypted post-translation document, and improve the confidentiality of the contents of the pre-translation document and the post-translation document.

  The above embodiment and its modifications can be described as in the following supplementary notes, but are not limited to the following.

(Appendix 1) Document encryption means for encrypting a pre-translation document with an encryption key, an encryption key transmission means for transmitting the encryption key, and an encryption key reception for receiving the encryption key transmitted by the encryption key transmission means A dictionary storage means for storing a dictionary including a set of information in which means, a headword, and a translation corresponding to the headword are associated; and the dictionary is encrypted by the encryption key received by the encryption key receiving means Dictionary encrypting means, pre-translation document transmitting means for transmitting the pre-translation document encrypted by the document encrypting means, and pre-translation document for receiving the pre-translation document transmitted by the pre-translation document transmitting means Receiving means; translation means for generating a translated document by translating the pre-translation document received by the pre-translation document receiving means based on an encrypted dictionary; and the post-translation sentence A post-translation document transmission unit that transmits the post-translation document transmission unit that receives the post-translation document transmitted by the post-translation document transmission unit, and the post-translation document reception unit that receives the post-translation document reception unit. A translation system comprising: a document decrypting means for decrypting with a decryption key corresponding to the encryption key.

(Supplementary note 2) The translation system according to supplementary note 1, wherein the pre-translation document transmission unit transmits the encrypted pre-translation document on the condition that the dictionary encryption by the dictionary encryption unit is completed.

(Supplementary note 3) Document encryption means, encryption key transmission means, encryption key reception means, dictionary encryption means, pre-translation document transmission means, pre-translation document reception means, translation means, post-translation document transmission means, post-translation document reception means The translation system according to Supplementary Note 1 or Supplementary Note 2, wherein the document decoding means is realized by at least one or more processors that operate according to the program.

(Supplementary Note 4) Document encryption means, encryption key transmission means, encryption key reception means, dictionary encryption means, pre-translation document transmission means, pre-translation document reception means, translation means, post-translation document transmission means, post-translation document reception means The translation system according to Supplementary Note 1 or Supplementary Note 2, wherein the document decrypting means is realized by at least one integrated circuit.

(Supplementary Note 5) A terminal device and a server communicable with the terminal device, the document encryption unit, the encryption key transmission unit, the pre-translation document transmission unit, the post-translation document reception unit, and the document decryption unit include the terminal The encryption key receiving means, the dictionary storage means, the dictionary encryption means, the pre-translation document reception means, the translation means, and the post-translation document transmission means provided in the apparatus are any one of Supplementary notes 1 to 4 provided in the server. The translation system described in Crab.

(Supplementary Note 6) Document encryption means, encryption key transmission means, encryption key reception means, dictionary storage means, dictionary encryption means, pre-translation document transmission means, pre-translation document reception means, translation means, post-translation document transmission means, translation 5. The translation system according to any one of appendix 1 to appendix 4, wherein the post document receiving unit and the document decrypting unit are provided in one server.

(Supplementary note 7) Document encryption means, encryption key transmission means, encryption key reception means, dictionary storage means, dictionary encryption means, pre-translation document transmission means, pre-translation document reception means, translation means, post-translation document transmission means, translation The translation system according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the post-document receiving unit and the document decoding unit are realized by independent devices and are distributed on the communication network.

(Supplementary Note 8) The document encryption means encrypts the pre-translation document with a public key, the dictionary encryption means encrypts the dictionary with the public key, and the document decryption means translates with a private key corresponding to the public key. The translation system according to any one of appendix 1 to appendix 7, which decrypts the post document.

  The present invention is preferably applied to a translation system that performs translation of a document.

DESCRIPTION OF SYMBOLS 1 Document encryption means 2 Encryption key transmission means 3 Encryption key reception means 4 Dictionary encryption means 5 Pre-translation document transmission means 6 Pre-translation document reception means 7 Translation means 8 Dictionary storage means 9 Translated document transmission means 10 Post-translation document reception Means 11 Document decryption means 21 Terminal device 22 Server

Claims (10)

Document encryption means for encrypting the pre-translation document with an encryption key;
An encryption key transmitting means for transmitting the encryption key;
Encryption key receiving means for receiving the encryption key transmitted by the encryption key transmitting means;
Dictionary storage means for storing a dictionary including a set of information in which an entry word is associated with a translation corresponding to the entry word;
Dictionary encryption means for encrypting the dictionary with the encryption key received by the encryption key receiving means;
Pre-translation document transmission means for transmitting the pre-translation document encrypted by the document encryption means;
Pre-translation document receiving means for receiving the pre-translation document transmitted by the pre-translation document transmission means;
Translation means for generating a post-translation document by translating the pre-translation document received by the pre-translation document reception means based on an encrypted dictionary;
A translated document transmitting means for transmitting the translated document;
A translated document receiving means for receiving the translated document transmitted by the translated document transmitting means;
A translation system comprising: a document decrypting unit configured to decrypt the translated document received by the translated document receiving unit with a decryption key corresponding to the encryption key. The translation system according to claim 1, wherein the pre-translation document transmission unit transmits the encrypted pre-translation document on the condition that the dictionary encryption by the dictionary encryption unit is completed. Document encryption means, encryption key transmission means, encryption key reception means, dictionary encryption means, pre-translation document transmission means, pre-translation document reception means, translation means, post-translation document transmission means, post-translation document reception means, and document decryption The translation system according to claim 1 or 2, wherein the means is realized by at least one processor operating according to a program. Document encryption means, encryption key transmission means, encryption key reception means, dictionary encryption means, pre-translation document transmission means, pre-translation document reception means, translation means, post-translation document transmission means, post-translation document reception means, and document decryption The translation system according to claim 1, wherein the means is realized by at least one integrated circuit. A terminal device and a server capable of communicating with the terminal device;
Document encryption means, encryption key transmission means, pre-translation document transmission means, post-translation document reception means, and document decryption means are provided in the terminal device,
The encryption key receiving unit, the dictionary storage unit, the dictionary encryption unit, the pre-translation document reception unit, the translation unit, and the post-translation document transmission unit are provided in the server. Translation system described in. A terminal device capable of communicating with a server that performs translation,
Document encryption means for encrypting the pre-translation document with an encryption key;
Encryption key transmitting means for transmitting the encryption key to the server;
Pre-translation document transmission means for transmitting the pre-translation document encrypted by the document encryption means to the server;
A post-translation document receiving means for receiving a post-translation document generated from the pre-translation document by the server from the server;
A terminal device comprising: a document decrypting unit configured to decrypt the translated document received by the translated document receiving unit with a decryption key corresponding to the encryption key. A server capable of communicating with a terminal device that generates an encrypted pre-translation document,
An encryption key receiving means for receiving, from the terminal device, an encryption key used when the terminal device encrypts the document before translation;
Dictionary storage means for storing a dictionary including a set of information in which an entry word is associated with a translation corresponding to the entry word;
Dictionary encryption means for encrypting the dictionary with the encryption key received by the encryption key receiving means;
A pre-translation document receiving means for receiving an encrypted pre-translation document transmitted by the terminal device;
Translation means for generating a post-translation document by translating the pre-translation document received by the pre-translation document reception means based on an encrypted dictionary;
A post-translation document transmission unit that transmits the post-translation document to the terminal device. The document encryption means encrypts the pre-translation document with the encryption key,
An encryption key transmitting means transmits the encryption key;
An encryption key receiving means receives the encryption key transmitted by the encryption key transmitting means;
The dictionary encryption unit encrypts a dictionary including a set of information in which a headword and a translation corresponding to the headword are associated with the encryption key received by the encryption key receiving unit,
The pre-translation document transmission means transmits the pre-translation document encrypted by the document encryption means,
The pre-translation document receiving means receives the pre-translation document transmitted by the pre-translation document transmission means,
A translation unit generates a post-translation document by translating the pre-translation document received by the pre-translation document reception unit based on an encrypted dictionary,
A translated document transmitting means transmits the translated document;
A translated document receiving means receives the translated document transmitted by the translated document transmitting means;
A translation method, wherein a document decryption unit decrypts the translated document received by the translated document reception unit with a decryption key corresponding to the encryption key. A program for a terminal device mounted on a computer that can communicate with a server that executes translation,
In the computer,
Document encryption process that encrypts the document before translation with the encryption key,
An encryption key transmission process for transmitting the encryption key to the server;
Pre-translation document transmission processing for transmitting the pre-translation document encrypted by the document encryption processing to the server;
A post-translation document reception process for receiving a post-translation document generated from the pre-translation document by the server from the server; and
A program for a terminal device for executing a document decryption process for decrypting the translated document received in the translated document reception process with a decryption key corresponding to the encryption key. A dictionary storage means for storing a dictionary including a set of information in which a headword and a translation corresponding to the headword are associated with each other, the computer being communicable with a terminal device that generates an encrypted pre-translation document A server program installed in a computer comprising:
In the computer,
An encryption key receiving process for receiving, from the terminal device, an encryption key used when the terminal device encrypts the document before translation;
Dictionary encryption processing for encrypting the dictionary with the encryption key received in the encryption key reception processing;
A pre-translation document reception process for receiving an encrypted pre-translation document transmitted by the terminal device;
A translation process for generating a post-translation document by translating the pre-translation document received in the pre-translation document reception process based on an encrypted dictionary; and
A server program for executing post-translation document transmission processing for transmitting the post-translation document to the terminal device.

Images