CN101577022B - Method for encrypting and decrypting CPU card data - Google Patents
Method for encrypting and decrypting CPU card data Download PDFInfo
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- CN101577022B CN101577022B CN 200910105744 CN200910105744A CN101577022B CN 101577022 B CN101577022 B CN 101577022B CN 200910105744 CN200910105744 CN 200910105744 CN 200910105744 A CN200910105744 A CN 200910105744A CN 101577022 B CN101577022 B CN 101577022B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
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Abstract
The invention relates to the safety technology of a CPU card, in particular to a method for encrypting and decrypting the CPU card data in the construction industry and the bank industry. The method comprises a KEY and is characterized in that the encrypting process comprises the following steps of: (1) dividing a data block; (2) implementing DES encryption through the KEY; (3) generating a MAC code through the KEY; and (4) adding the MAC code; the decrypting process comprises the following steps of: (a) removing the MAC code; (b) calculating the MAC value through the KEY; (c) comparing the MAC value with the received MAC code; if the two are the same, transferring to the step (e); (d) failing the MAC inspection and stopping; and (e) implementing DES decryption through the KEY. The invention provides a method for encrypting and decrypting the CPU card data with higher safety performance.
Description
Technical field
The present invention relates to CPU card safety technique, relate in particular to data encryption and the decryption method of a kind of building cause CPU card and banking industry CPU card.
Background technology
Up to now, China has had near more than 180 urban applications the communication IC-card system of different scales, issued volume is above 1.5 hundred million, city contactless logic encryption card of choice for use when using the IC-card system of 95% is arranged approximately, be equivalent to have approximately 1.4 hundred million logical encrypts to be stuck in China urban transportation cause IC-card system and use.Its range of application has covered public transport, subway, taxi, ferry, and the field such as small amount consumption.Yet the early stage main flow of using of current huge field of traffic with card MIFARE S50 card but As time goes on, many technical deficiencies have been shown especially, maximum problem is low no more than security performance, mass transit card card and card reader that a chief reason that causes the security performance deficiency is exactly current main-stream, the transmission of data is taked expressly to be eavesdropped by the offender easily between card reader and the system, distorts, analyze even decode, then copied.Caused very big hidden danger for China's urban transportation cause IC-card security of system.In a single day card image is suffered to copy on a large scale, and the IC-card system will face huge threat.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art part and provide a kind of security performance the high data encryption of CPU card and decryption method.
Purpose of the present invention can be achieved through the following technical solutions:
The data encryption of a kind of CPU card and decryption method comprise a key K EY, it is characterized in that ciphering process may further comprise the steps: (1) partition data piece; (2) carry out des encryption by key K EY; (3) generate the MAC code by key K EY; (4) additional MAC code; Decrypting process may further comprise the steps: (a) reject the MAC code; (b) calculate the MAC value by key K EY; (c) MAC value and the MAC code of receiving are compared, if identical, turn (e); (d) MAC verification failure stops; (e) carry out the DES deciphering by key K EY.
The data encryption of a kind of CPU card and decryption method, it is characterized in that, described partition data piece of (1) step refers to the data of transmission are divided into the data block that 8 bytes are unit with this data block, is expressed as BLOCK1, BLOCK2, BLOCK3, BLOCK4......; Last data block might be 1～8 byte, if the length of last data block is 8 bytes, then after this data block, add again 8 complete byte data pieces ' 80 00 00 00 00 00 00 00 ', if curtailment 8 bytes of last data block, then add 16 system numbers ' 80 ' thereafter, if reach 8 byte lengths, then turned for (2) step, otherwise adding 16 system numbers ' 00 ' until length reaches 8 bytes thereafter, turning again for (2) step.
The data encryption of a kind of CPU card and decryption method, it is characterized in that, described generation MAC code of (3) step, further may further comprise the steps: (3-1) initial value with 8 byte longs is set as 16 system numbers ' 00 00 00 00 00 00 00 00 '; (3-2) all input data are connected into a data block by specified order; (3-3) this data block is divided into the data block that 8 bytes are unit, is expressed as BLOCK1, BLOCK2, BLOCK3, BLOCK4......; Last data block might be 1～8 byte; If the length of last data block is 8 bytes, then after this data block, add again 8 complete byte data pieces ' 80 00 00 00 00 00 00 00 ', forward (3-4) step to; If curtailment 8 bytes of last data block then add 16 system numbers ' 80 ' thereafter, if reach 8 byte lengths, then forward (3-4) step to; Otherwise adding 16 system numbers ' 00 ' until length reaches 8 bytes thereafter, forwarding (3-4) step to; The data that (3-4) obtain behind data block BLOCK1 and initial value ' the 00 00 00 00 00 00 00 00 ' XOR are encrypted by KEY and are obtained ciphertext, encrypt after as initial value and BLOCK2 XOR with this ciphertext again .... so analogize; (3-5) final calculation result is got high 4 bytes as the MAC code.
The data encryption of a kind of CPU card and decryption method is characterized in that, described CPU card is contactless CPU card.
The data encryption of CPU card and the decryption method that the present invention relates to, adopt the des encryption algorithm, carry out the ciphertext transmission, simultaneously, adopt the integrality of MAC checking data, must support and hold the key that generates the MCA code and just can transmit legal data, prevent that the third party to the distorting of data, guaranteeing integrality and the authenticity of data.Compared with prior art, CPU card of the present invention data encryption and decryption method have more security.
Description of drawings
Fig. 1 is first embodiment of the invention encryption flow figure.
Fig. 2 is first embodiment of the invention deciphering process flow diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.First embodiment of the present invention is a kind of contactless CPU card data encryption and decryption method, the FM1208 chip that hardware can adopt Shanghai Fudan Microelectronics Co., Ltd to produce.The method of 56 secret key encryption 64 bit data is adopted in DES (Data Encryption Standard) encryption and decryption.With reference to figure 1, Fig. 2, the data encryption of CPU card and the decryption method of first embodiment of the invention comprise a key K EY, it is characterized in that ciphering process may further comprise the steps: (1) partition data piece; (2) carry out des encryption by key K EY; (3) generate the MAC code by key K EY; (4) additional MAC code; Decrypting process may further comprise the steps: (a) reject the MAC code; (b) calculate the MAC value by key K EY; (c) MAC value and the MAC code of receiving are compared, if identical, turn (e); (d) MAC verification failure stops; (e) carry out the DES deciphering by key K EY.In the present embodiment, described partition data piece of (1) step refers to the data of transmission are divided into the data block that 8 bytes are unit with this data block, is expressed as BLOCK1, BLOCK2, BLOCK3, BLOCK4......; Last data block might be 1～8 byte, if the length of last data block is 8 bytes, then after this data block, add again 8 complete byte data pieces ' 80 00 00 00 00 00 0000 ', if curtailment 8 bytes of last data block, then add 16 system numbers ' 80 ' thereafter, if reach 8 byte lengths, then turned for (2) step, otherwise adding 16 system numbers ' 00 ' until length reaches 8 bytes thereafter, turning again for (2) step.In the present embodiment, described generation MAC code of (3) step, further may further comprise the steps: (3-1) initial value with 8 byte longs is set as 16 system numbers ' 00 00 00 00 00 00 00 00 '; (3-2) all input data are connected into a data block by specified order; (3-3) this data block is divided into the data block that 8 bytes are unit, is expressed as BLOCK1, BLOCK2, BLOCK3, BLOCK4......; Last data block might be 1～8 byte; If the length of last data block is 8 bytes, then after this data block, add again 8 complete byte data pieces ' 80 00 00 00 00 00 00 00 ', forward (3-4) step to; If curtailment 8 bytes of last data block then add 16 system numbers ' 80 ' thereafter, if reach 8 byte lengths, then forward (3-4) step to; Otherwise adding 16 system numbers ' 00 ' until length reaches 8 bytes thereafter, forwarding (3-4) step to; The data that (3-4) obtain behind data block BLOCK1 and initial value ' the 00 00 00 00 00 00 00 00 ' XOR are encrypted by KEY and are obtained ciphertext, encrypt after as initial value and BLOCK2 XOR with this ciphertext again .... so analogize; (3-5) final calculation result is got high 4 bytes as the MAC code.The data encryption of CPU card and the decryption method of present embodiment, adopt the des encryption algorithm, carry out the ciphertext transmission, simultaneously, adopt the integrality of MAC checking data, must support and hold the key that generates the MCA code and just can transmit legal data, prevent that the third party to the distorting of data, guaranteeing integrality and the authenticity of data.CPU card of the present invention data encryption and decryption method have more security.
Claims (2)
1. CPU card data encryption and decryption method comprise a key K EY, it is characterized in that,
Ciphering process may further comprise the steps:
(1) partition data piece;
(2) carry out des encryption by key K EY;
(3) generate the MAC code by key K EY;
(4) additional MAC code;
Decrypting process may further comprise the steps:
(a) reject the MAC code;
(b) calculate the MAC value by key K EY;
(c) MAC value and the MAC code of receiving are compared, if identical, turn (e);
(d) MAC verification failure stops;
(e) carry out the DES deciphering by key K EY;
Described partition data piece of (1) step refers to the data of transmission are divided into the data block that 8 bytes are unit with this data block, is expressed as BLOCK1, BLOCK2, BLOCK3, BLOCK4 Last data block might be 1 ~ 8 byte, if the length of last data block is 8 bytes, then after this data block, add again 8 complete byte data pieces ' 80 00 00 00 00 00 00 00 ', if curtailment 8 bytes of last data block, then add 16 system numbers ' 80 ' thereafter, if reach 8 byte lengths, then turned for (2) step, otherwise adding 16 system numbers ' 00 ' until length reaches 8 bytes thereafter, turning again for (2) step;
Described generation MAC code of (3) step further may further comprise the steps:
(3-1) initial value with 8 byte longs is set as 16 system numbers ' 00 00 00 00 00 00 00 00 ';
(3-2) all input data are connected into a data block by specified order;
(3-3) this data block is divided into the data block that 8 bytes are unit, is expressed as BLOCK1, BLOCK2, BLOCK3, BLOCK4 Last data block might be 1 ~ 8 byte; If the length of last data block is 8 bytes, then after this data block, add again 8 complete byte data pieces ' 80 00 00 00 00 00 00 00 ', forward (3-4) step to; If curtailment 8 bytes of last data block then add 16 system numbers ' 80 ' thereafter, if reach 8 byte lengths, then forward (3-4) step to; Otherwise adding 16 system numbers ' 00 ' until length reaches 8 bytes thereafter, forwarding (3-4) step to;
The data that (3-4) obtain behind data block BLOCK1 and initial value ' the 00 00 00 00 00 00 00 00 ' XOR are encrypted by KEY and are obtained ciphertext, encrypt after as initial value and BLOCK2 XOR with this ciphertext again ..., so analogize;
(3-5) final calculation result is got high 4 bytes as the MAC code.
2. a kind of CPU card according to claim 1 data encryption and decryption method is characterized in that, described CPU card is contactless CPU card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910105744 CN101577022B (en) | 2009-03-13 | 2009-03-13 | Method for encrypting and decrypting CPU card data |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910105744 CN101577022B (en) | 2009-03-13 | 2009-03-13 | Method for encrypting and decrypting CPU card data |
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| CN101577022A CN101577022A (en) | 2009-11-11 |
| CN101577022B true CN101577022B (en) | 2013-03-27 |
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| CN 200910105744 Expired - Fee Related CN101577022B (en) | 2009-03-13 | 2009-03-13 | Method for encrypting and decrypting CPU card data |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103198269B (en) * | 2012-01-06 | 2017-05-10 | 上海华虹集成电路有限责任公司 | Anti-failure key storage system |
| CN102739406B (en) * | 2012-07-17 | 2014-12-10 | 飞天诚信科技股份有限公司 | Method for securely transmitting equipment information |
| CN106529651B (en) * | 2016-11-15 | 2019-03-08 | 安徽汉威电子有限公司 | A kind of radio frequency card using double-encryption algorithm |
Citations (3)
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|---|---|---|---|---|
| CN1386249A (en) * | 2000-06-08 | 2002-12-18 | 布尔Cp8公司 | Method for secure storage of sensitive data in a silicon chip integrated system storage, in particular a smart carp, and integrated system therefor |
| CN101110141A (en) * | 2006-06-29 | 2008-01-23 | 英卡股份有限公司 | Method for key diversification on an ic card |
| CN101132276A (en) * | 2007-09-27 | 2008-02-27 | 中兴通讯股份有限公司 | Method and system for symmetrical encryption of terminal data by SAM card |
-
2009
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386249A (en) * | 2000-06-08 | 2002-12-18 | 布尔Cp8公司 | Method for secure storage of sensitive data in a silicon chip integrated system storage, in particular a smart carp, and integrated system therefor |
| CN101110141A (en) * | 2006-06-29 | 2008-01-23 | 英卡股份有限公司 | Method for key diversification on an ic card |
| CN101132276A (en) * | 2007-09-27 | 2008-02-27 | 中兴通讯股份有限公司 | Method and system for symmetrical encryption of terminal data by SAM card |
Non-Patent Citations (2)
| Title |
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| 于洪洲 等.智能卡的系统安全.《第六届全国信息获取与处理学术会议论文集》.2008, * |
| 马雪英.数据传输安全方案的设计与实现.《教育信息化》.(第05期), * |
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Inventor after: Yang Jingyuan Inventor after: Feng Ming Inventor after: Zheng Zhigang Inventor after: Li Nengjun Inventor before: Yang Jingyuan Inventor before: Liang Jianjun Inventor before: Li Nengjun |
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Address after: 518004 east of 3 building, Peng Ji industrial zone, Luohu District Liantang, Shenzhen, Guangdong, China, 3 Patentee after: Shenzhen Aisino Tak Technology Co. Ltd. Address before: 518004 east of 3 building, Peng Ji industrial zone, Luohu District Liantang, Shenzhen, Guangdong, China, 3 Patentee before: Shenzhen Takcere Credit Card Manufacturing Co., Ltd. |
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Granted publication date: 20130327 Termination date: 20190313 |