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Block cipher system using multi-chaotic mapping multi-dynamic S-box

A technology of block cipher and chaotic mapping, which is applied in transmission system, digital transmission system, and key distribution, and can solve problems such as slow operation speed, low security, and difficult hardware implementation

Inactive Publication Date: 2011-05-04
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome defects such as low security, slow operation speed, and difficult hardware implementation of the chaotic digital cipher system in the current technology, and provide a block cipher system that can improve the performance of the chaotic digital cipher and apply multiple chaotic maps and multiple dynamic S-boxes

Method used

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  • Block cipher system using multi-chaotic mapping multi-dynamic S-box
  • Block cipher system using multi-chaotic mapping multi-dynamic S-box
  • Block cipher system using multi-chaotic mapping multi-dynamic S-box

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Experimental program
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Embodiment 1

[0024] Embodiment one: see figure 1 , figure 2 , figure 1 Among them, the four chaotic maps iterate 1600 times respectively to generate two 128-bit initial sequences with , according to formula (2) to generate the first wheel key . In the figure, Indicates the key First bytes, , , , , 128-bit initial sequence The first byte of (order ), Indicates XOR operation, function Indicates that the key The right 64 bits are assigned to the wheel key .

[0025] figure 2 In, the plaintext block , is the first i round-robin subkey of 8 bytes, the i wheel output block (it is the first ( i +1) round of input).

[0026] This embodiment provides a chaotic block cipher system using multiple discrete chaotic maps and multiple dynamic S-boxes. The cipher system includes four modules in total. The implementation of each module will be further described in detail below.

[0027] Subkey generation module mode:

[0028] The chaotic system used in...

Embodiment approach

[0192] plaintext Divide into a series of chunks of length 64 bits:

[0193] ,

[0194] make representation block 8 bytes, ie . Use the round transformation function f Encrypt each data block in turn, assuming that the number of rounds for each data block encryption is wheel, then the block The encryption process of can be described by the following formula:

[0195] , (3)

[0196] In formula (3), , ,function It is defined as follows:

[0197] , (4)

[0198] In formula (4), the function is the dynamic S-box generated by module (2), is the first i round-robin subkey of 8 bytes. From formula (3), we can see that the first i wheel output block is the first ( i +1) rounds of input (except the last round). Therefore, the r round (last round) output is the ciphertext block. The length of the ciphertext block is also 64 bits (8 bytes), the same as the length of the plaintext block. In the past, the ciphertext file size of many chaotic cr...

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Abstract

The invention relates to a block cipher system using a multi-chaotic mapping multi-dynamic S-box. The block cipher system comprises a sub-key generation module, a dynamic S-box generation module, an encryption module and a decryption module. The system is operated by the following steps: generating round cyclic sub-keys by utilizing a plurality of chaotic systems; generating a plurality of dynamic S-boxes by utilizing the plurality of chaotic systems; encrypting non-hidden file by using the encryption module; and decrypting the non-hidden file by using the decryption module according to an inverse order with an encrypting process after the non-hidden file is encrypted. The block cipher system using the multi-chaotic mapping multi-dynamic S-box of the invention greatly improves the encryption / decryption computation speed, simultaneously brings convenience to hardware implementation by using a modular program design method, and can be widely used in a plurality of fields such as governments, electronic commerce, military affairs, digital banks and the like.

Description

1. Technical field: [0001] The invention belongs to the chaotic digital cipher design technology in the field of information security, and is a chaotic block cipher system using multiple discrete chaotic mapping and multi-dynamic S-boxes, in particular to a grouping cipher system using multiple chaotic mapping and multi-dynamic S-boxes. 2. Background technology: [0002] With the rapid development of Internet technology, computer network technology is increasingly widely used in various fields of society, and the security and confidentiality of information is particularly important. In order to ensure network information security, researchers at home and abroad have designed and published many cryptographic algorithms. The current cryptographic algorithms mainly include sequence ciphers, block ciphers, public key ciphers, and hash functions. Among them, block cipher, also known as block cipher, is an important research branch in modern cryptography, mainly composed of three ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L9/08
Inventor 武相军路杨王红涛王慧贾培艳张济仕
Owner HENAN UNIVERSITY
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