JP3923634B2 - CD security system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a CD creation system that writes data to a CD (CD-R / RW disc), and more particularly to a CD security system that enables security management of data using a password.
[0002]
[Prior art]
Conventionally, in order to provide security for data on a CD, a unique CD format or unique hardware has been required (for example, JP-A-8-7340).
As another security measure, a method of scrambling data to be written itself has been performed.
[0003]
[Problems to be solved by the invention]
As described in the prior art, in order to realize a CD security system, a dedicated system having a unique CD format or unique hardware is required.
However, the conventional method requires a dedicated system equipped with a unique CD format, unique hardware, etc. in order to realize a CD security system, and it cannot be configured for general use. There was a problem.
Further, when encryption such as scramble is performed on the data itself, there is a problem that high technology and knowledge about encryption and the like are required, so that it cannot be easily realized.
In addition, normally, a single CD can only be given one type of security, and a plurality of types of security cannot be applied.
[0004]
The first object of the present invention is to solve these problems and to realize a CD security system that can easily create a CD subjected to password security management without departing from a general-purpose CD format. (Invention of Claim 1 and Claim 2).
A second problem is to realize a CD security system capable of easily creating a CD capable of making useful information invisible with a general-purpose CD-ROM reader or the like without departing from a general-purpose CD format. (Invention of Claim 3 and Claim 4).
Furthermore, a third problem is to realize a CD security system capable of managing a plurality of useful data on one CD with a plurality of passwords (inventions of claims 5 and 6).
[0005]
[Means for Solving the Problems]
The invention of claim 1A first step of selecting data to be written to the CD-R or CD-RW and setting a password; a second step of starting writing when the password setting is completed; and a volume descriptor and first selecting A third step of creating CD format information comprising the structured information of the data set and the password sector holding the set password, and creating a CD image comprising the CD format information and the selected data; A CD format comprising a fourth step of writing a recorded CD image to a CD-R or CD-RW and closing it as one session, a volume descriptor, and data structure information indicating that "data does not exist" A fifth step of creating information and creating a CD image again; A CD image created in the above step is added as a new session after the session written in the fourth step, and the session is closed after the additional recording is completed. This is a CD creation method.
[0006]
  In the invention of claim 2,The CD creation method according to claim 1 is repeatedly written on one CD-R or CD-RW.
[0007]
ClaimThe invention of 3CD-ROr CD-RWMeans for selecting a plurality of devices storing data to be written to, means for selecting data to be written from the selected devices, and a CD-R based on the selected informationOr CD-RWFor creating format information of CD-ROM and CD-R based on the format informationOr CD-RWAnd a formatted CD-ROr CD-RWA CD creating system comprising means for writing the selected data inFirst means for enabling selection of data to be written to the CD-R or CD-RW and setting of a password; and second means for starting writing upon completion of the password setting;
Create CD format information consisting of the volume descriptor, the structure information of the previously selected data, and the password sector holding the set password, and create a CD image consisting of the CD format information and the selected data. Third means, fourth means for writing the created CD image to the CD-R or CD-RW and closing it as one session, a volume descriptor, and data indicating that “data does not exist” 5th means for creating CD format information consisting of the following structure information and re-creating the CD image, and the CD image created by the fifth means as a new session and the session written by the fourth means 6th hand to add later and close the session after the endWhen,It is a CD creation system characterized by having.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the CD security system of the present invention will be described in detail with reference to the drawings.
Since the CD security system of the present invention can be broadly divided into creation of a security CD and reading of the security CD, the first and second embodiments will be described below with respect to creation of a CD. In the third embodiment, a description will be given of ensuring security when a created CD is read.
Normally, when a CD is mounted on a general-purpose CD-ROM reader composed of a general-purpose CD-ROM drive, a general-purpose read driver, and a general-purpose computer, the latest session information is always mounted on the OS according to the CD-ROM standard. .
In the present invention, paying attention to this point, when a CD created by a security CD creation program is inserted into a general-purpose CD-ROM reader, it is mounted on the OS as an empty disk in which no data is stored. Yes.
In other words, the general-purpose CD-ROM reader cannot access other useful data held in the security CD, so that it is possible to guarantee the security of the CD.
[0012]
FirstThe first embodiment has a first feature in that a CD security system capable of easily creating a CD subjected to security management by a password without deviating from a general-purpose CD format is realized.TheIn addition, a CD security system that easily creates a CD that can make useful information invisible (non-displayed) with a general-purpose CD-ROM reader without departing from the general-purpose CD format. Have the second feature. First, the security CD creation system will be described.
[0013]
FIG. 2 is an external view showing an example of the configuration of the main part of the security CD creation system in the CD security system of the present invention. In the figure, PC indicates a general-purpose computer, Dr indicates a general-purpose CD-R drive, and SCSI indicates a SCSI (interface) device.
[0014]
The security CD creation system shown in FIG. 2 includes a general-purpose computer PC and a general-purpose CD-R drive Dr.
The general-purpose computer PC and the general-purpose CD-R drive Dr are connected by a SCSI device or the like.
The general-purpose computer PC is equipped with a security CD creation program.
The operator performs selection of write data, setting of an arbitrary password, execution of writing, and the like by operating the security CD creation program.
[0015]
FIG. 3 is a functional block diagram showing an example of an embodiment of the main configuration of the security CD creation system shown in FIG. In the figure, 1 is a CPU, 2 is a CD-R / RW disc writing device, 3 is a RAM, 4a to 4c are write data storage devices, 5 is a program storage unit, 6 is an intermediate data storage unit, and 7 is CD image data storage. , 8 is a keyboard, 9 is a mouse, 10 is a display control device, 11 is a display, and 12 is a system bus.
[0016]
The function of each part is roughly as follows.
The CPU 1 uses the program stored in the program storage unit 5 corresponding to the command input from the keyboard 8 or mouse 9, via the system bus 12, the keyboard 8, the RAM 3, the display control device 10, the CD-R / RW disk writing device 2, etc. The central processing means has a function of controlling the entire system as a whole and executing a predetermined calculation, processing, and the like.
The CD-R / RW disc writing device 2 itself includes a CPU and a RAM (not shown), and temporarily holds write data transferred in accordance with an instruction from the CPU 1 of the system shown in FIG. A write data buffer is provided, and a CD disc is created.
[0017]
The RAM 3 is storage means for storing information necessary for CD creation, for example, information on one of the selected write data storage devices 4a to 4c, information on selected write data in the device, and the like. is there.
Further, it is also used as a storage means when converting various information or when a program instructs the CD-R / RW disc writing device 2 to write data, and partially creates CD image data. .
The write data storage devices 4a to 4c are devices for storing data to be written, and FIG. 3 shows a case where three write data storage devices 4a to 4c are provided. Each of the storage devices 4a to 4c stores actual write data used for CD disc creation. These write data storage devices 4a-4c may be four or more, or may be two.
[0018]
Each of the write data storage devices 4 a to 4 c can be selected in accordance with an instruction from the keyboard 8 or the mouse 9.
The program storage unit 5 is a storage means for storing a program for controlling the system shown in FIG. 3, and stores a program for creating a CD disc mounted in the CD security system of the present invention.
The intermediate data storage unit 6 is storage means for holding data to be written on the CD disc and table of contents information in a state converted into intermediate data.
The CD image data storage unit 7 is a device that is used when a CD image is actually created once and then written to the CD-R / RW disc writing device 2.
[0019]
The keyboard 8 and mouse 9 are input means for selecting or inputting a write data device necessary for an operator's CD disc creation operation and system control, and further selecting or inputting write data from the selected device. It has a function.
The display control device 10 has a function for controlling display of the display 11 such as a CRT or LCD, and displays information stored in the RAM 3 and information such as window and icon patterns corresponding to various functions. 11 is visibly displayed on the screen.
The above is the outline of the function of each part of the security CD creation system of the present invention, and is the hardware configuration common to the inventions of claims 1 to 5.
[0020]
Next, operations of the security CD creation system shown in FIG. 3 according to the security CD creation program installed in this system will be described.
1) When the security CD creation program installed in the system starts, the operator selects data to be written to the CD and sets a password.Do.When password setting is completed, writing is started.
2) This program creates CD format information consisting of the volume descriptor, the structure information of the previously selected data, and the password sector that holds the set password, and from the CD format information and the selected data. Create a CD image.
[0021]
3) Write the created CD image to the CD and close it as one session.
4) This program again creates CD format information consisting of the volume descriptor and the data structure information indicating that “data does not exist”, and converts it into a CD image again.To do.
5) Add the CD image created in 4) above as a new session after the session written in 3) above.To do.After the appending is finished, the session is closed.
Mentioned aboveFIG.The operation by the security CD creation program installed in the security CD creation system is shown in the flowchart.
[0022]
FIG. 1 is a flowchart showing the main processing flow of a security CD creation program installed in the CD security system of the present invention. In the figure, # 1 to # 8 indicate steps.
[0023]
In the flow of FIG. 1, one write operation by the system of the present invention is executed by the processing of steps # 3 to # 8.
More specifically, session N is written by the processing of steps # 3 to # 5, and session (N + 1) is written by the processing of steps # 6 to # 8.
In step # 1, the operator selects data to be written on the CD and sets a password.
In step # 2, writing is started.
In step # 3, CD format information including write data and a password sector and a CD image (1) are created.
[0024]
In step # 4, the created CD image (1) is written on the CD.
In step # 5, the session is closed as one session.
In step # 6, CD format information indicating that “data does not exist” and a CD image (2) are created.
In step # 7, the created CD image (2) is written on the CD.
In step # 8, the session is closed and the flow of FIG.
Next, an example of CD data arrangement will be described for the CD security system of the present invention.
[0025]
FIG. 4 is a diagram showing an example of the data arrangement of a CD created by writing the security CD creation program once in the CD security system of the present invention.
[0026]
FIG. 4 shows one unit of writing.
In the general-purpose CD-ROM reading system, the data structure of the latest session is always mounted.
In the case of the data arrangement of FIG. 4, since the information that “no data (file and directory) exists” is held in the 2nd Session path table 1, there is no file or directory on the OS. It looks like it doesn't exist.
The details are listed below.
[0027]
11) The 1st Session starts from sector 0. A volume descriptor group holding volume information is allocated from the sector 16 of the 1st Session. In the volume descriptor, there is an area that holds start position information of a path table that stores data structure information indicating a file or directory structure existing in the session.
12) The password set by the operator according to the security CD creation program is held in the sector next to the volume descriptor group of 11) above.The
[0028]
13) A path table group is held from the sector next to the password sector in which the password of the previous 12) is held.
14) The data written by the selection of the operator is held in the path table group in the previous 13) and the sector group after the other additional information holding unit.
15) After the first session of 11) to 14), a volume descriptor group and a path table group are held as a second session. The path table group holds information indicating that no data exists.The
[0029]
As described above, in the first embodiment, when the selected data is written to the CD, the means for writing the password by the user, and the means for writing the password in the next sector of the volume information holding area on the CD, Has providedTheSecond, when writing the selected data, the logical data structure information of the data to be originally written and the means for writing the data to be originally written from the sector next to the sector where the password is written, and the logic in the volume information holding area Means for writing the start sector position of the logical data structure information holding area in the data structure information starting sector holding unit;TheThird, there is a means to write as a single session and automatically write the next session after closing that session.TheFourth, there is provided means for writing the logical data structure indicating that no data exists in the logical data structure information holding area in the session that is automatically written.TheTherefore, it is possible to perform data security management using a password.
[0030]
Second embodiment
AheadIn the first embodiment of the present invention, at the time of writing once, by holding information that “no data (file and directory) exists” in the path table, data security management by password is performed. As described above, the second embodiment is characterized in that writing is performed a plurality of times.
[0031]
As described in the first embodiment, when a CD is mounted on a general-purpose CD-ROM reader composed of a general-purpose CD-ROM drive, a general-purpose read driver, and a general-purpose computer, the CD-ROM standard Thus, the latest session information is always mounted on the OS.
Therefore, when a CD created by the security CD creation program is inserted into the general-purpose CD-ROM reader, it is mounted on the OS as an empty disk in which no data is stored.
In other words, the general-purpose CD-ROM reader cannot access other useful data held in the security CD, and as a result, the security of the CD is guaranteed.
This point is exactly the same when writing a plurality of times.
[0032]
FIG. 5 is a diagram showing an example of data arrangement of a CD created by writing a security CD creation program a plurality of times in the CD security system of the present invention.
[0033]
FIG. 5 shows a case where the writing units are “No. 1” to “No. 3”.
Each writing unit is basically the same as that shown in FIG. 4 and consists of two sessions.
One password is provided for each of them.
In addition, information indicating that “no data (file and directory) exists” is stored in the path table, and when the passwords do not match, it is mounted on the OS as an empty disk in which no data is stored. Therefore, data security management by password is realized.
[0034]
As described above, in the second embodiment, the operation described in the first embodiment is set as one writing unit, and the writing unit can be written to a CD a plurality of times. ing.
Accordingly, different passwords can be set for a plurality of sessions on one CD.
[0035]
Third embodiment
AheadIn the first and second embodiments, the case of creating a CD by the CD security system of the present invention has been described. However, in the third embodiment, when a CD created in this way is read. It is characterized in that the user can input a password and mount session data including a password that matches the input password. First, a security CD reading system will be briefly described.
[0036]
FIG. 6 is an external view showing an example of the configuration of the main part of the security CD reading system in the CD security system of the present invention. The reference numerals in the figure are the same as those in FIG. 2, and Dr2 indicates a general-purpose CD-ROM drive.
[0037]
The security CD reading system shown in FIG. 6 includes a general-purpose computer PC and a general-purpose CD-ROM drive Dr2. The hardware configuration of the general-purpose computer PC is basically the same as that shown in FIG.
The general-purpose computer PC and the general-purpose CD-ROM drive Dr2 are connected by a SCSI device or the like.
In the case of this security CD reading system, the general-purpose computer PC is loaded with a security CD reading program.
With this security CD reading program, a password is input, a session is mounted on the OS, and the like.
[0038]
FIG. 7 is a diagram for explaining the read operation of the created security CD in the CD security system of the present invention shown in FIG.
[0039]
21) After the security CD reading program is started, the operator inputs a password suitable for the session desired to be read.
22) This security CD reading program reads the start sector position of the path table from the volume descriptor of the first session of the inserted CD.
Next, the password held in the sector (password sector) immediately before the path table start sector read in 21) above is read and compared with the password input by the operator.
23) If both passwords match as a result of the comparison in the previous 22), the contents of the session are mounted on the OS.
[0040]
24) If the passwords do not match, they are held in the password sector of the next session (matching the first session in one writing unit by the security CD creation program) following the session that is the password reading target. Read the current password and compare it with the password entered by the operator.
25) The above comparison operations 23) to 24) are repeated until the passwords match.
26) If the password does not match the session immediately before the last session existing on the CD to be read (the first session in the last writing unit by the security CD creation program), a message indicating that, etc. Is displayed, and the operator who has operated is displayed.
The operation of the security CD reading program installed in the security CD creation system of FIG. 3 described above is shown in the flowchart.
[0041]
FIG. 8 is a flowchart showing the main processing flow of the security CD reading program installed in the CD security system of the present invention. In the figure, # 11 to # 16 indicate steps.
[0042]
FIG. 8 shows a case where data is written a plurality of times for each writing unit on one CD as described with reference to FIG.
In step # 11, the user inputs a password.
In step # 12, the input password is compared with the password n (= 1) of the writing unit “No.n (= 1)” by the program.
If the two passwords match, in step # 13, the session data is mounted on the OS.
[0043]
If the passwords do not match, the process proceeds to step # 14 to check whether the next writing unit “No.n + 1” exists.
If the next writing unit “No.n + 1” exists, in step # 15, n is incremented by “+1”, and the process returns to the previous step # 12 again. The input password and the writing unit “No. The password n + 1 "is compared with the password n + 1.
The above processing is executed until the passwords match.
[0044]
As a result of the comparison in step # 12, if the passwords do not match and it is detected in step # 14 that the next writing unit “No.n + x” does not exist, the process proceeds to step # 16. In step # 16, a message “no data (file and directory) exists” is displayed, and the flow of FIG. 8 is terminated. As described above, in the third embodiment, the password is input, and the CD security system of the invention that matches the input password.SystemThe session data including password can be mounted. Therefore, it is possible to show different session data to different users with one CD.
[0045]
【The invention's effect】
Of this embodimentThe CD security system includes means for writing a password by a user and writing a password in a sector next to the volume information holding area on the CD when the selected data is written to the CD in the CD creation system. . Therefore, it is possible to perform data security management using a password.
[0046]
Of this embodimentCD security systemChooseWhen writing the selected data, the logical data structure information of the data to be originally written and the means for writing the data to be originally written from the sector next to the sector where the password was written, and the logical data structure information in the volume information holding area are started. The sector holding unit includes means for writing the start sector position of the logical data structure information holding area. ThereforeCIt is possible to write a sector holding password information on a CD in a format that does not deviate from the D format standard.
[0047]
  Of this embodimentCD security systemIs CThe writing in the D security system is written as one session, and after the session is closed, the next session can be automatically written. ThereforePanCD-ROM reading systemAnd calligraphyIt is possible to hide the entered data.
[0048]
  Of this embodimentCD security systemThe selfA logical data structure indicating that no data exists can be written in the logical data structure information holding area in the dynamically written session. ThereforePanCD-ROM reading systemAnd calligraphyIt is possible to hide the entered data.
[0049]
  Of this embodimentIn CD security system,After closing the session that records the password, automatically writes the next session that records the absence of dataThe operation is one writing unit, and the writing unit can be written a plurality of times on one CD. ThereforeOneDifferent passwords can be set for a plurality of sessions on a single CD.
[0050]
  Of this embodimentCD security systemThe CDWhen reading a CD created by the security system, enter the password and match the entered password.RuThe session data including the password can be mounted. ThereforeOneA single CD can show different session data to different users.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a main processing flow of a security CD creation program installed in a CD security system of the present invention.
FIG. 2 is an external view showing an example of a main configuration of a security CD creation system in the CD security system of the present invention.
FIG. 3 is a functional block diagram showing an example of an embodiment of the main configuration of the security CD creation system shown in FIG. 2;
FIG. 4 is a diagram showing an example of the data arrangement of a CD created by writing a security CD creation program once in the CD security system of the present invention.
FIG. 5 is a diagram showing an example of data arrangement of a CD created by writing a security CD creation program a plurality of times in the CD security system of the present invention.
FIG. 6 is an external view showing an example of a configuration of a main part of a security CD reading system in the CD security system of the present invention.
7 is a diagram for explaining a read operation of a created security CD in the CD security system of the present invention shown in FIG. 6; FIG.
FIG. 8 is a flowchart showing the main processing flow of the security CD reading program installed in the CD security system of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... CD-R / RW disc writing device, 3 ... RAM, 4a-4c ... Writing data storage device, 5 ... Program storage part, 6 ... Intermediate data storage part, 7 ... CD image data storage unit, 8 ... keyboard, 9 ... mouse, 10 ... display control device, 11 ... display

Claims (3)

A first step of selecting data to be written to the CD-R or CD-RW and setting a password;
When the setting of the password is completed, a second step of starting writing,
Create CD format information consisting of the volume descriptor, the structure information of the previously selected data, and the password sector holding the set password, and create a CD image consisting of the CD format information and the selected data. A third step;
A fourth step of writing the created CD image to a CD-R or CD-RW and closing it as one session;
A fifth step of creating CD format information again composed of volume descriptors and data structure information indicating that “data does not exist”, and re-creating a CD image;
A sixth step in which the CD image created in the fifth step is added as a new session after the session written in the fourth step, and the session is closed after the addition is completed;
A CD creation method characterized by comprising:   A CD creation method, wherein the CD creation method according to claim 1 is repeated and written on one CD-R or CD-RW. Means for selecting a plurality of devices storing data to be written to CD-R or CD-RW; means for selecting data to be written from the selected devices; and CD-R or CD- based on the selected information Means for creating RW format information, means for formatting a CD-R or CD-RW based on the format information, and means for writing the selected data in the formatted CD-R or CD-RW In the CD creation system that
First means for enabling selection of data to be written to the CD-R or CD-RW and setting of a password;
A second means for starting writing upon completion of the password setting;
Create CD format information consisting of the volume descriptor, the structure information of the previously selected data, and the password sector holding the set password, and create a CD image consisting of the CD format information and the selected data. A third means;
A fourth means for writing the created CD image to a CD-R or CD-RW and closing it as one session;
A fifth means for creating again a CD image by creating CD format information consisting of volume descriptors and data structure information indicating that “data does not exist”;
A sixth means for appending the CD image created by the fifth means as a new session after the session written by the fourth means, and closing the session after the appending is completed;
A CD creation system characterized by comprising:

Images