Code computing method based on nonlinear theory

Abstract

The invention discloses a high security code computing method. The method comprises two chaotic systems F1 and F2. According to the method, a plaintext is calculated through an equation (1) so as to obtain a chaotic state ciphertext; an equation (2) takes the ciphertext obtained in the equation (1) as an original state and starts computation; and a computation result of the equation (2) is returned to the equation (1) again and used as the original state to realize iterative operation, unless the ciphertext intensity meets the encryption requirement. The decryption method is inverse operation of the encryption method. The code computing method as a high security code system provides another beneficial choice for various users needing information security protection.

Description

technical field [0001] The invention relates to a password system for information security, which can ensure the safe transmission and storage of digital signals. Background technique [0002] At present, based on nonlinear science, especially the research on cryptography based on chaos has received extensive attention. Its theory comes from the unpredictability of the chaotic dynamics behavior of the chaotic system when the initial state or control parameters are unknown. Some publications have been published. Classical related cryptographic systems, for the input plaintext, these systems generally use the number of chaotic iterations based on the lookup table (look_up table), or some kind of mixing of chaotic state values ​​and other values ​​to generate ciphertext. [0003] Baptista proposed a search mechanism-based cryptographic system Cryptography with chaos in Physics Letters A and a series of improved versions based on this design. The plaintext unit length is an inte...

AI Technical Summary

Problems solved by technology

[0006] When the dynamic behavior of the chaotic system is realized digitally on the computer, due to the precision problem of converting the continuous domain to the digital domain, there is a problem of the collapse of the chaotic orbit. This is also a problem that the cryptographic system based on chaos needs to solve through technical means, but this is still Problems easily overlooked by published chaotic encryption systems

[0007] At present, it is known that these designs are generally lower in efficiency than the commonly used AES or DES algorithms. Therefore, drawing on the design results of existing systems and jumping out of the classic ideas in chaotic cipher design, a safe and efficient non-linear cipher is designed. The system is a problem that those skilled in the art are committed to solving

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