Cipher device adopting Feistel-PG structure and encryption method

A technology of a cryptographic device and an encryption method, applied in the field of communication, can solve problems such as inability to meet, and achieve the effects of flexible design, high flexibility and low implementation cost

Inactive Publication Date: 2013-04-17
INST OF SOFTWARE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the fact that the "existing structure" cannot meet all the requirements of current algorithm design, according to the requirements of cryptographic algor...

Method used

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  • Cipher device adopting Feistel-PG structure and encryption method
  • Cipher device adopting Feistel-PG structure and encryption method
  • Cipher device adopting Feistel-PG structure and encryption method

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Embodiment Construction

[0041] The present invention will be described in detail below through specific embodiments and accompanying drawings.

[0042] The encryption device of the present embodiment adopts a 64-bit processor, and the configuration of the Feistel-PG encryption structure adopted by the processor is as follows: Figure 4 As shown, wherein (a) is a schematic diagram of Feistel-PG encryption structure, and (b) is a flowchart of processor processing, and the specific instructions are as follows:

[0043] The round function F maps a string of t×k×m bits to a string of t×k×m bits (where t, k, and m are all positive integers, such as t=4, k=4, m=4 or t =6,k=8,m=4), the input X of the round function is mapped to U through linear transformation P and nonlinear transformation G, that is, X→U, where U=G(P(X));

[0044] The linear transformation P is based on the permutation of t×k×m bit strings, which is the positional transformation of t×m k-bit strings;

[0045] The nonlinear transformation ...

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Abstract

The invention discloses a cipher device adopting a Feistel-PG structure and an encryption method. The Feistel-PG structure consists of a round function F, the round function F maps a t*k*m bit string into a t*k*m bit string, the input X is mapped into U through linear conversion P and nonlinear conversion G, the linear conversion P is displacement based on the t*k*m bit string and is the position conversion of t*m k bit characters, the nonlinear conversion G is concatenation of t nonlinear conversions based on t*k bit string, the nonlinear conversion T is nonlinear conversion based on k*m bit string, and T converts (um-1 to u1, u0) into A (S(um-1 to u1, u0)) through S box layer and linear conversion A, wherein the S box layer is formed by m k*k s boxes through concatenation, and the linear conversion A is linear conversion based on k*m bit string. The encryption method adopting the Feistel-PG encryption structure comprises round key addition, linear conversion P and nonlinear conversion G, the output of plaintext W after the r-round iteration is used as ciphertext. Through the device and the method provided by the invention, the cipher algorithm design is more flexible, and in addition, lower realization cost can be realized at the same security intensity.

Description

technical field [0001] The present invention proposes a cryptographic device and an encryption method using a Feistel-PG encryption structure, which can be applied to the design of cryptographic algorithms under various parameters, can make the design of cryptographic algorithms more flexible, and can have lower security under the same security strength. The realization cost of belongs to the field of communication technology. Background technique [0002] The design of cryptographic algorithms has always been a hot spot in cryptography research, and its design is based on the confusion and diffusion principles proposed by Shannon. Confusion principle: Complicates the statistical relationship between ciphertext and key, making it impossible to obtain the statistical characteristics of the key by using ciphertext. Diffusion principle: Spread the statistical characteristics of the plaintext into the ciphertext, so that each bit of the ciphertext is related to several bits of ...

Claims

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Application Information

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IPC IPC(8): H04L9/06
Inventor 吴文玲张蕾于晓丽
Owner INST OF SOFTWARE - CHINESE ACAD OF SCI
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