Second order side channel energy analysis method for SM4 cipher algorithm
A technology of energy analysis and cryptographic algorithm, applied in the direction of encryption device with shift register/memory, etc., can solve the problem of second-order energy analysis without systematic analysis method, etc.
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[0056] The technical scheme of the present invention will be described in detail below. First, the SM4 cryptographic algorithm with the same S-box input and output intermediate mask value is used to perform CPA analysis to illustrate the technical scheme of the present invention. The typical implementation of the SM4 algorithm's first-order mask defense method is as follows image 3 As shown, the input value S_in and the output value S_out of the S box are both XORed by the mask value m=(m 0 , M 1 , M 2 , M 3 ). The newly constructed S′ box is j is 0, 1, 2, 3, x j Represents the jth byte in 32 bits x. For the first-order mask defense method of SM4 algorithm, Xor the input and output of the S box to eliminate the mask:
[0057] S _ InXorOut = S _ in ′ ⊕ S _ out ′ = S _ in ⊕ S _ out , Among them, j is 0, 1, 2, 3
[0058] S _ InXorOu t j = S ( X i + 1 , j ⊕ X i + 2 , j ⊕ X...
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