Key anti-power attack method

Abstract

The invention discloses a key anti-power attack method. The method includes the step that a preset atomic block is utilized to perform point multiplying and / or point adding operation in scalar multiplication, wherein the preset atomic block contains modular multiplication operation, addition operation and subtraction operation. According to the method, the concept of the atomic algorithm is combined with the characteristics of a public key cryptographic algorithm, and therefore, the procedures of point adding operation and point multiplying operation can be optimized; an corresponding variables are adopted to control the internal loop of the scalar multiplication, and the scalar multiplication is converted to a modular multiplication-addition-subtraction atomic block loop. With the method of the invention adopted, computation burden required by the scalar multiplication can be greatly decreased, and the security of keys can be ensured, and the computation speed of the public key cryptographic algorithm can be improved.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method for a key to resist power consumption attacks. Background technique [0002] The power consumption attack is a side-channel attack method that uses the power consumption leakage of the device during the calculation of the cryptographic algorithm to obtain the key. Such as figure 1 As shown, the power consumption of the cryptographic chip is closely related to the instructions and data of the algorithm operation, which also provides the possibility of power consumption attacks. Power consumption attacks mainly include two types of power analysis, namely Simple Power Analysis (SPA) and Differential Power Analysis (DPA). During the SPA process, the attacker infers the corresponding operations at different times by observing the power consumption curve of the encryption process, thereby extracting part or all of the keys. In the DPA process, the attacker main...

AI Technical Summary

Problems solved by technology

At present, the SM2 algorithm is mostly used in smart card chips. Power consumption attacks have a small key search space and high analysis efficiency, which poses a great threat to the security of smart card chips.

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