Method and test circuit for preventing data encryption algorithm (DES) attack based on power analysis

A power consumption analysis and algorithm technology, applied in the direction of encryption devices with shift registers/memory, etc., can solve the problems of increasing complexity and achieve the effect of ensuring security

Inactive Publication Date: 2013-04-24
SOUTHEAST UNIV
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  • Method and test circuit for preventing data encryption algorithm (DES) attack based on power analysis
  • Method and test circuit for preventing data encryption algorithm (DES) attack based on power analysis
  • Method and test circuit for preventing data encryption algorithm (DES) attack based on power analysis

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[0025] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0026] In order to overcome the potential safety hazard caused by using the same mask between two rounds of traditional symmetric encryption, the present invention proposes a method for preventing DES algorithm attacks based on power analysis. The code value and position are different from other rounds, which makes it impossible to eliminate the effect of the mask when using the Hamming distance model. The specific process of this program is as follows figure 1 Shown, where X is a random number, ...

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Abstract

The invention discloses a method and test circuit for preventing data encryption algorithm (DES) attack based on power analysis. Before a first subkey K1 carries out operation on data, an algorithm process is kept the same with an original DES process, after xor is conducted on a plaintext through the subkey K1 in a first round, a mask off code X is led in, operation of encryption processes from a following second round to a fifteenth round is similar, only numerical values of random numbers of the xor are different, and correctness of processing procedures in the arithmetic is ensured. At last, the mask off code X on the xor is output in a sixteenth round, real ciphertext information is restored through inverse permutation between initial permutation (IP) and final permutation (FP) and a mask off code X4. According to the DES, due to the fact that values and positions of mask off codes added in the first round and the last round are different from those of other rounds, namely encryption by non symmetrical mask off codes, so that effects of the mask off codes cannot be eliminated by adoption of a hamming distance model, and therefore power attack on the DES can be prevented, and the purpose of ensuring safety of a DES secret key is achieved.

Description

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Claims

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Application Information

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Owner SOUTHEAST UNIV
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