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novel 4*4 S box construction method special for passwords

A construction method, a new type of technology, applied in the field of cryptography, which can solve problems such as difficulties

Active Publication Date: 2019-06-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of constructing S-boxes through mathematical functions is more difficult in producing 4×4 S-boxes with higher cryptographic strength

Method used

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  • novel 4*4 S box construction method special for passwords
  • novel 4*4 S box construction method special for passwords
  • novel 4*4 S box construction method special for passwords

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Embodiment Construction

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] see figure 1 , the present embodiment provides a novel password-specific 4×4 S-box construction method, the novel password-specific 4×4 S-box construction method comprising the following steps:

[0019] Step 1. For each AE class Gi, select the known S box S i (i=0,...,15), search to get a series of new S boxes, the search method is S...

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Abstract

The invention discloses a novel password-dedicated 4 * 4 S box construction method, which comprises the following steps that: firstly, for each affine equivalent (AE) class Gi, selecting a known S boxSi, and searching according to a preset search mode to obtain a series of new S boxes, the search mode being S '(x) = M1 (Si (M0T (x)), i = 0-15; wherein x is input, S'is a newly searched S box, M0 and M1 are 4 * 4 row increasing reversible matrixes, and gradually increasing numerical values of rows of the matrixes from top to bottom; screening out the S boxes meeting the design requirements fromthe searched S boxes; traversing P1 (P0 (x + a))) + b on the screened S boxes to obtain all the S boxes meeting the design requirements; wherein P0 and P1 are 4 * 4 permutation matrixes, and a and bare 4 bit vectors; and finally selecting the S box with the fixed point number of 0 as a final target. According to the method, the traversal AE class and the S box feature screening are combined, sothat a large number of 4 * 4 S boxes with higher password intensity can be constructed.

Description

technical field [0001] The invention relates to the technical field of cryptography, in particular to a novel cryptographic-specific 4×4 S-box construction method. Background technique [0002] S-boxes are widely used in modern symmetric cipher designs, especially block ciphers and hash functions. In block ciphers, the S-box is usually used as the only non-linear part to provide confusion and ensure the security of the entire cryptographic algorithm. The S-box can be regarded as a Boolean function with n-bit input and m-bit output, called n×m S-box. When n and m are large, almost all S-boxes are nonlinear and have good cryptographic strength, but too large n and m will increase the storage capacity of the algorithm. Common S-box sizes are 8×8 or 4×4. Compared with the 8×8 S-box, the 4×4 S-box has more advantages in the environment with limited resources, so it is often used in lightweight cryptographic algorithms. Many currently known algorithms, such as Serpent, Present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06
CPCH04L9/06
Inventor 王小云贾珂婷魏淙洺孙悦
Owner TSINGHUA UNIV