Encryption/decryption method and system based on chaos hybrid self-synchronizing method

Abstract

The objective of the invention is to provide a method of chaotic hybrid self-synchronization. Both communication sides get digital signal after sampling and analog-digital conversion of local continuous chaotic signal respectively at regular intervals. Sender executes pulse synchronization to continuous chaotic system with received digital signal and then transmits error correction signal including 1bit information to receiver. Receiver executes pulse synchronization to its continuous chaotic system with corrected digital signal. Continuous chaotic system at different location only need to transmit error correction information of 1bit to keep long period of steady synchronization through the synchronization method. Occupation rate to channel by redundant information fall to low and anti-attack ability of chaotic system is improved efficiently. The digital chaotic sequence output by chaotic system that synchronized through the invention can be used to encrypt data as pseudo-random sequence or key stream; the output continuous chaotic signal can be used to design encryption communication system that based on chaotic synchronization.

Description

technical field [0001] The present invention relates to password generation technology in the field of information security, more specifically, to a chaotic self-synchronization method, and an encryption and decryption method and system based on the synchronization method. Background technique [0002] In recent years, chaos has begun to be applied in the field of secure communication. Chaos is an external complex manifestation caused by internal randomness in a deterministic system, and it is a seemingly random non-random motion. Due to the characteristics of ergodicity, broadband, noise-like, sensitivity to initial conditions, fast-decaying autocorrelation and weak cross-correlation, chaotic signals provide rich mechanisms and methods for realizing secure communication. There are two types of chaotic encryption systems: digital chaotic system and continuous (or analog) chaotic system. [0003] The digital chaotic system is less affected by noise interference and device pa...

AI Technical Summary

Problems solved by technology

However, this method requires the sending end to send the chaotic sampling value used as a synchronization pulse to the receiving end, so the sampling value may be intercepted by an attacker and use these sampling values ​​to infer the type of chaotic system, restore the chaotic system parameters or some other characteristics So as to achieve the purpose of cracking the password system

In addition, in addition to the need to transmit ciphertext in the channel, synchronization pulses also need to be transmitted, which also greatly increases the occupancy rate of the channel bandwidth and reduces the efficiency of information transmission

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