S box evolution generator and generation method

Abstract

The invention provides an S box evolution generator which comprises a random source, more than two different conversion parts, a cryptology index computing and judging part, a threshold judger and a buffer. The evolution generation process comprises the steps of: initializing stored contents in the buffer into unit replacement; generating random numbers by the random source, sending the stored contents in the buffer into one of conversion parts according to the values of the random numbers; sending a conversion result into the buffer after one of the conversion parts is converted, simultaneously sending into the cryptology index computing and judging part for computing a cryptology index and judging whether the index of the conversion result is qualified or not; if so, clearing the conversion times, outputting the conversion result to be used as an S box generated by the evolution; if not, adding 1 into the conversion times; and then in the threshold judger, comparing the conversion times and the preset threshold, if the conversion times are small than the threshold, returning to continue the evolution until the conversion times reach the threshold and resetting the contents of the buffer into the unit replacement.

Description

technical field [0001] The invention belongs to the field of information security applications, in particular to an S-box evolution generator and a generation method. Background technique [0002] Password is the key to information security, how to design a secure password mechanism is the focus of cryptography research. Ciphers can be divided into symmetric ciphers and asymmetric ciphers. Symmetric ciphers can be divided into stream ciphers, block ciphers, and hash algorithms. The S-box has important applications in the design of symmetric ciphers such as stream ciphers, block ciphers, and hash functions, and is the main nonlinear transformation component. When designing the S-box, the cryptographic indicators such as nonlinearity, differential uniformity, and algebraic immunity of the S-box are mainly considered. [0003] In the prior art, the design of the S-box has the following methods: traditionally, cryptographers will design the S-box with cryptographic significan...

AI Technical Summary

Problems solved by technology

Recently, the evolutionary method has been introduced into the design of cryptographic functions. This method has the characteristics of parallelization and automation. However, according to the public literature, the cryptographic indicators of S-boxes designed by most evolutionary methods are not ideal or efficient.

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