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

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

technical field [0001] The invention relates to a method and a test circuit for preventing DES algorithm attacks based on power consumption analysis, in particular to a method and a circuit for preventing attacks on DES algorithms based on power consumption analysis, which can prevent attacks on DES algorithms by using asymmetric mask encryption operations. The power consumption attack of an algorithm chip belongs to the field of integrated circuit security technology. Background technique [0002] The US National Security Agency (NIST) announced an encryption algorithm developed by IBM's computer cryptography research project team in 1977, and approved it as the data encryption standard for non-confidential departments, referred to as DES. DES algorithm is by far the most widely used and popular symmetric encryption algorithm in the world. Although DES has now been replaced by the new encryption standard AES, many encryption chips in China still use the DES algorithm, whic...

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But this makes multiple clocks appear in a system, which greatly increases the complexity of the back-end implementation

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