Method for password protection for constructing unidirectional hash function based on infinite dimension ultra-chaos

Abstract

The invention discloses a method for cryptoguard by utilization of infinite dimensional hyperchaos for construction of unilateral hash functions, wherein, a plaintext and a key are taken as initial values of two hyperchaos Chen systems provided with delay feedback at first; evolvement is performed according to characteristics of chaotic dynamics of the system; a final result of evolvement is quantized; the quantized value is substituted into key streams for iteration; confusion and diffusion of plaintext information and key information are realized, and a 128-bit Hash value of the plaintext with any length is generated on the basis of a cipher block chain mode. The method of the invention performs cryptoguard by construction of the Hash functions, fully utilizes signals generated by an infinite dimensional hyperchaos system to improve the scrambling performance of the signals and the sensitivity of parameters, and has stronger attack resistance and better safety to predicted attacks.

Description

technical field The invention belongs to the technical field of information security, relates to a password protection method, in particular to a method for password protection using a one-way hash (Hash) function constructed by an infinite-dimensional hyperchaotic characteristic and a key stream. Background technique The cryptographic one-way hash (Hash) function is one of the most important cryptographic encoding methods in use today. Hash functions are widely used in the IT industry, security protocols and programs, for example, software integrity testing, digital signature systems, message authentication and password protection, etc. Hash functions are an important basis for IT industry and security protocols, and typical applications include digital signatures and password protection. With the rapid development of modern commerce, finance and other fields, long-distance transactions and communications are becoming more and more important. At this time, the two parties ...

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Problems solved by technology

Others proposed to construct a one-way Hash function based on the space-time chaotic system. When using the one-way Hash function technology for password protection, when filling the plaintext, only some characters are filled and no information of the plaintext is added, so collisions are easy to occur.

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