CN103178958B - Based on the file encryption-decryption device of multilayer rolling code - Google Patents

Abstract

The invention discloses a file encryption and decryption device based on multi-layer rolling codes. In order to overcome technical security loopholes such as poor confidentiality and weak anti-attack ability of the existing file encryption technology, the present invention includes a keyboard, a USB interface circuit, a controller, a data storage, a multi-layer rolling code encryption chip, a multi-layer rolling code decryption chip, The private input circuit, the user information memory, the keyboard and the USB interface circuit are respectively connected to the controller, and the controller is also respectively connected to the data memory, the multi-layer rolling code encryption chip, and the multi-layer rolling code decryption chip, and the data memory They are respectively connected to a multi-layer rolling code encryption chip and a multi-layer rolling code decryption chip, the private input circuit is connected to a multi-layer rolling code encryption chip, and the user information storage is connected to a multi-layer rolling code decryption chip. The invention is used for encryption and decryption processing of file data transmission, and has good confidentiality, strong anti-attack ability, safety, good expansibility and convenient use.

Description

File encryption and decryption device based on multi-layer rolling code

technical field

The invention relates to a file encryption and decryption device, in particular to a file encryption and decryption device based on multi-layer rolling codes.

Background technique

Data transmission encryption technology is one of the core technologies in the field of information security, and countries all over the world attach great importance to it. At present, the field of data encryption transmission is almost dominated by fixed code technology, and the application of fixed code technology has been quite mature. However, the fixed code has the fatal weakness of weak anti-attack ability and poor security. Especially once the key of the system is leaked, it will cause the collapse of the entire encryption system. For example: confidential ciphertexts are deciphered; important information is leaked; bank and securities system customer accounts and passwords are easily stolen, etc., which is enough to illustrate the seriousness of this problem.

Contents of the invention

The object of the present invention is to address the above-mentioned deficiencies and provide a file encryption and decryption device based on multi-layer rolling codes, which has good confidentiality, strong anti-attack capability, safety, good scalability and easy use.

In order to achieve the above object, the technical solution of the present invention is that the file encryption and decryption device based on multi-layer rolling codes includes a keyboard, a controller, a USB interface circuit, and a data storage device, and the controller is connected to the keyboard, the USB interface circuit, and the data storage device respectively. Connection, it also includes private input circuit, user information memory, multi-layer rolling code encryption chip, multi-layer rolling code decryption chip;

The multi-layer rolling code encryption chip includes an encryption controller, an encryption input circuit, an encryption multi-layer key generation circuit, a multi-layer rolling code encryption circuit, a double synchronous count value effective time window generation circuit, an encryption registration circuit, an encryption output circuit, Encrypted built-in memory;

The encryption controller is respectively connected with the controller, the encryption input circuit, the encryption multi-layer key generation circuit, the multi-layer rolling code encryption circuit, and the encryption registration circuit, and the encryption input circuit is respectively connected with the data memory and the multi-layer rolling code encryption circuit Connected, the encryption multi-layer key generation circuit is connected with the multi-layer rolling code encryption circuit and the private input circuit respectively, and the multi-layer rolling code encryption circuit is connected with the double synchronous count value effective time window generation circuit and the encryption output circuit respectively, The dual synchronous counter value effective time window generation circuit is connected to the encrypted built-in memory, the encrypted output circuit is connected to the data memory, and the encrypted registration circuit is connected to the encrypted output circuit;

The multi-layer rolling code decryption chip includes a decryption controller, a decryption input circuit, a decryption multi-layer key generation circuit, a multi-layer rolling code decryption circuit, a double synchronization count value effective time window inspection circuit, a user identification circuit, a decryption registration circuit, Decrypt output circuit, decrypt built-in memory;

The decryption controller is respectively connected with the controller, the decryption input circuit, the decryption multi-layer key generation circuit, the multi-layer rolling code decryption circuit, the user identification circuit, and the decryption registration circuit, and the decryption input circuit is respectively connected with the data memory, the multi-layer The rolling code decryption circuit is connected, and the decryption multi-layer key generation circuit is connected with the multi-layer rolling code decryption circuit and the user identification circuit respectively, and the user identification circuit is connected with the user information storage, and the multi-layer rolling code decryption circuit is respectively connected with the user identification circuit. The dual synchronous count value effective time window inspection circuit is connected to the decryption output circuit, the dual synchronous count value effective time window inspection circuit is connected to the decryption built-in memory, the decryption output circuit is connected to the data memory, and the decryption registration circuit is connected to the decryption output circuit connection.

The invention is composed of a keyboard, a USB interface circuit, a controller (single-chip microcomputer), a data memory, a multi-layer rolling code encryption chip, a multi-layer rolling code decryption chip, a private input circuit and a user information memory. The multi-layer rolling code encryption circuit and the multi-layer rolling code decryption circuit are respectively packaged in an encryption chip and a decryption chip manufactured with CPLD/FPGA chips.

The present invention is based on the multi-layer rolling code encryption and decryption technology, which adopts the multi-layer rolling key generation technology combining public secret and private secret, so that the key, dual-time matching window and encryption algorithm of the multi-layer rolling code encryption and decryption system are time-sensitive It is constantly changing all the time, which greatly improves the anti-attack ability of the encryption system and the security of the system. Even in extreme cases where the public secret is leaked, the stealer cannot crack the key of any user, decipher the ciphertext sent by any user, and it is even less likely to cause the collapse of the entire key system.

In order to overcome the fundamental defect of "one text, one secret" of the fixed code technology, the present invention creates the theory and technology based on the encryption and decryption algorithm of the quadratic nonlinear multi-layer nested rolling code, and the dual synchronous counter value time window matching technology rotating at different angular speeds And multi-algorithm mixed coding technology, which improves the confidentiality and anti-attack ability of the encryption and decryption system, has significant advantages in multiple changes, anti-interception, anti-copying, anti-coding scanning, etc., and reduces the risk of being deciphered and system crashes. It expands the application range of rolling code technology, and has wide application value in keyless access control system, identity authentication system, data encryption transmission and other fields.

The present invention has following characteristics:

① Good confidentiality. The present invention can set multiple sets of private passwords, and each set of private and public secrets is combined to generate a unique key system, which is used to communicate with different objects, or to store encrypted files by itself;

The present invention also has the function of learning and registering. When two users do encrypted communication for the first time, they must learn and register. Only by knowing the password of the other party can the receiving party register the other party and record various important information of the other party, otherwise, it cannot be decrypted.

②Strong anti-attack ability. According to the multi-layer rolling code encryption technology, the present invention realizes "multiple secrets in one document" and "multiple secrets in one document". The system has a high code hopping rate, a long theoretical time interval for sending repeated codes, and has a strong ability to resist various high-tech attacks such as interception, copying, and code scanning.

③Extensibility is good. The present invention adopts a modular design, and new expansion function modules can be added according to user requirements. For example, adding a locking module makes it impossible for others to use the device.

④Easy to use. The product design is humanized, and it is very convenient for users to use.

The invention is used for encryption and decryption processing of file data transmission, and has good confidentiality, strong anti-attack ability, safety, good expansibility and convenient use.

Description of drawings

Figure 1 is a schematic diagram of the present invention.

In the figure, 1. keyboard, 2. controller, 3. USB interface circuit, 4. multi-layer rolling code encryption chip, 5. encryption input circuit, 6. encryption multi-layer key generation circuit, 7. encryption controller, 8 .Multi-layer rolling code encryption circuit, 9. Encrypted registration circuit, 10. Private input circuit, 11. Encrypted output circuit, 12. Double synchronous count value effective time window generation circuit, 13. Encrypted built-in memory, 14. User identification circuit, 15. User information memory, 16. Decryption registration circuit, 17. Decryption output circuit, 18. Multi-layer rolling code decryption chip, 19. Decryption built-in memory, 20. Multi-layer rolling code decryption circuit, 21. Valid time of double synchronous counting value Window verification circuit, 22. decryption multi-layer key generation circuit, 23. decryption input circuit, 24. data memory, 25. decryption controller.

Detailed ways

As shown in Figure 1, the present invention is based on the file encryption and decryption device of multi-layer rolling code, comprises keyboard 1, controller 2, USB interface circuit 3, data memory 24, and this controller 2 is respectively connected with keyboard 1, USB interface circuit 3, Data memory 24 is connected, and it also comprises secret input circuit 10, user information memory 15, multi-layer rolling code encryption chip 4, multi-layer rolling code decryption chip 18;

The multi-layer rolling code encryption chip 4 includes an encryption controller 7, an encryption input circuit 5, an encryption multi-layer key generation circuit 6, a multi-layer rolling code encryption circuit 8, a double synchronous count value effective time window generation circuit 12, an encryption registration Circuit 9, encrypted output circuit 11, encrypted built-in memory 13;

The encryption controller 7 is respectively connected with the controller 2, the encryption input circuit 5, the encryption multi-layer key generation circuit 6, the multi-layer rolling code encryption circuit 8, and the encryption registration circuit 9, and the encryption input circuit 5 is respectively connected with the data memory 24. The multi-layer rolling code encryption circuit 8 is connected, and the encrypted multi-layer key generation circuit 6 is connected with the multi-layer rolling code encryption circuit 8 and the private input circuit 10 respectively, and the multi-layer rolling code encryption circuit 8 is connected with the double synchronous code respectively. The counter value effective time window generation circuit 12 is connected to the encryption output circuit 11, the double synchronous count value effective time window generation circuit 12 is connected to the encryption built-in memory 13, the encryption output circuit 11 is connected to the data memory 24, and the encryption registration Circuit 9 is connected with encryption output circuit 11;

The multi-layer rolling code decryption chip 18 includes a decryption controller 25, a decryption input circuit 23, a decryption multi-layer key generation circuit 22, a multi-layer rolling code decryption circuit 20, a dual synchronous count value effective time window inspection circuit 21, a user identification Circuit 14, decryption registration circuit 16, decryption output circuit 17, decryption built-in memory 19;

The decryption controller 25 is respectively connected with the controller 2, the decryption input circuit 23, the decryption multi-layer key generation circuit 22, the multi-layer rolling code decryption circuit 20, the user identification circuit 14, and the decryption registration circuit 16. The decryption input circuit 23 is connected with data memory 24, multi-layer rolling code decryption circuit 20 respectively, and described decryption multi-layer key generation circuit 22 is connected with multi-layer rolling code decryption circuit 20, user identification circuit 14 respectively, and described user identification circuit 14 is connected with user The information memory 15 is connected, and the multi-layer rolling code decryption circuit 20 is connected with the valid time window inspection circuit 21 and the decryption output circuit 17 of the dual synchronous count value respectively. The decryption output circuit 17 is connected to the data memory 24, and the decryption registration circuit 16 is connected to the decryption output circuit 17.

Claims (1)

1. A file encryption and decryption device based on a multi-layer rolling code, comprising a keyboard (1), a controller (2), a USB interface circuit (3), and a data storage device (24), and the controller (2) is respectively connected to the keyboard ( 1), USB interface circuit (3), data memory (24) connection, it is characterized in that it also includes private input circuit (10), user information memory (15), multi-layer rolling code encryption chip (4), multi-layer Rolling code decryption chip (18); The multi-layer rolling code encryption chip (4) includes an encryption controller (7), an encryption input circuit (5), an encryption multi-layer key generation circuit (6), a multi-layer rolling code encryption circuit (8), a double synchronous counting Value valid time window generation circuit (12), encryption registration circuit (9), encryption output circuit (11), encryption built-in memory (13); The encryption controller (7) is respectively connected with the controller (2), the encryption input circuit (5), the encryption multi-layer key generation circuit (6), the multi-layer rolling code encryption circuit (8), and the encryption registration circuit (9) Connect, described encryption input circuit (5) is connected with data memory (24), multi-layer rolling code encryption circuit (8) respectively, and described encryption multi-layer key generation circuit (6) is respectively connected with multi-layer rolling code encryption circuit ( 8), the private input circuit (10) is connected, and the multi-layer rolling code encryption circuit (8) is respectively connected with the double synchronous counting value effective time window generation circuit (12), the encryption output circuit (11), and the double synchronous counting The value effective time window generation circuit (12) is connected to the encrypted built-in memory (13), the encrypted output circuit (11) is connected to the data memory (24), and the encrypted registration circuit (9) is connected to the encrypted output circuit (11) ; The multi-layer rolling code decryption chip (18) includes a decryption controller (25), a decryption input circuit (23), a decryption multi-layer key generation circuit (22), a multi-layer rolling code decryption circuit (20), a double synchronous counting Value effective time window inspection circuit (21), user identification circuit (14), decryption registration circuit (16), decryption output circuit (17), decryption built-in memory (19); The decryption controller (25) is respectively connected with the controller (2), the decryption input circuit (23), the decryption multi-layer key generation circuit (22), the multi-layer rolling code decryption circuit (20), the user identification circuit (14) , the decryption registration circuit (16) is connected, and the decryption input circuit (23) is connected with the data memory (24) and the multi-layer rolling code decryption circuit (20) respectively, and the decryption multi-layer key generation circuit (22) is respectively connected with The multi-layer rolling code decryption circuit (20) is connected to the user identification circuit (14), the user identification circuit (14) is connected to the user information memory (15), and the multi-layer rolling code decryption circuit (20) is respectively connected to the double synchronous The count value effective time window inspection circuit (21) is connected to the decryption output circuit (17), the double synchronous count value effective time window inspection circuit (21) is connected to the decryption built-in memory (19), and the decryption output circuit (17) It is connected with the data memory (24), and the decryption registration circuit (16) is connected with the decryption output circuit (17).