A method and device for resisting energy attack of des algorithm

Abstract

The invention discloses a method and device for resisting energy attacks of a DES algorithm, wherein the method includes: performing XOR operation on the first round key and the first mask; The mask determines the corrected S box in the first round and replaces the original S box in the first round; the second half of the input data in the first round is XORed with the second mask, and the result of the XOR operation is the first half of the output data in the first round part; the 2nd to 16th rounds replace the original S box with the same or different modified S boxes, each round determines the modified S box according to the mask of the round key belt and the mask of the second half of the round input data, and the rest of the algorithm flow The algorithm flow is the same as that of the first round; the XOR operation is performed on the output of the 16th round after the inverse initial permutation and the modified mask, and the result of the XOR operation is the output ciphertext. Through the DES algorithm anti-energy attack method provided by the invention, the energy attack can be effectively resisted.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method and device for resisting energy attacks of a DES algorithm. Background technique [0002] With the development of computer technology and the continuous improvement of social informatization, information security issues are more and more widely reproduced by people. Encryption, as a powerful weapon in information security, is playing an important role. Various encryption algorithms are constantly emerging. The DES algorithm has experienced long-term tests since it became the encryption standard in the 1970s to today. [0003] In addition to analyzing the cryptographic algorithm itself, a new and powerful attack method has emerged in recent years, which is called side channel attack (Side Channel Attack). Side-channel attack refers to the attack and analysis of the cryptographic system by the attacker using the bypass information leaked during the operation ...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the above-mentioned method does not consider the characteristics of multiple iterations of the block cipher, and the masked intermediate value will still leak the password information after XOR, which cannot effectively Anti-power attack

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