Secure Communication System and Method Based on Open Limited Feedback and Dynamic Matrix Coding

Abstract

The present invention relates to a public limited feedback and dynamic matrix coding-based secure communication system and method and belongs to the communication information security field. The system includes a dynamic matrix encoder arranged at the physical layer of a transmitting end, and a dynamic matrix decoder arranged at the physical layer of a receiving end, wherein the transmitting end communicates with the receiving end through a main channel, and the receiving end carries out feedback through a public limited feedback channel. The method includes the following steps that: at the transmitting end, the dynamic matrix encoder judges whether the last transmitting of an information packet is successful according to the feedback of the receiving end, generates a transmitting end sparse random matrix according to a plaintext sequence which is successfully transmitted the last time, and obtains transmitting code words; and at the receiving end, the dynamic matrix decoder generates a receiving end sparse random matrix according to a plaintext sequence which is successfully received the last time, decodes currently received code words so as to obtain a corresponding received plaintext, carries out integrity check, and feeds back a check result to the transmitting end. With the system and method of the invention adopted, secure and reliable information transmission under an error-prone channel can be realized.

Description

Technical field [0001] The invention belongs to the field of communication information security, and particularly relates to a secure communication system and method based on public limited feedback and dynamic matrix coding. Background technique [0002] With the rapid development and wide application of wireless communication technology, users continue to put forward new requirements for the transmission reliability and information security of wireless communication systems. Since the wireless channel is naturally open and broadcast, it is extremely vulnerable to interference and eavesdropping. How to design a safe and reliable wireless communication system has become an urgent problem to be solved. [0003] In traditional wireless communication systems, the security of data is guaranteed by encryption algorithms at the application layer, and the reliability of data is guaranteed by error correction codes at the physical layer. Traditional secure communication systems such as f...

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that the safety interval required for the normal operation of the system is relatively large.

[0006] From the above analysis, it can be seen that the first scheme does not require the main channel condition to be better than that of the wiretapping channel, but an additional key negotiation process is required at both ends of the transceiver, and at the same time the security of transmission is difficult to be guaranteed; the second scheme does not require additional keys at both ends of the transceiver. The key agreement process can guarantee the security of transmission at the same time, but requires a large security interval

Therefore, neither of the above two solutions can properly realize the safe and reliable transmission of physical layer information, and it is difficult to meet the needs of future wireless communication.

Images