Anti-power-attack method and device for DES (Data Encrypt Standard) algorithm

Abstract

The invention discloses an anti-power-attack method and device for a DES (Data Encrypt Standard) algorithm. The method comprises the following steps: performing exclusive-or operation on a first-round sub-key and a first mask; determining a first-round correction S-box according to the first mask on the basis of an original first-round S-box, and substituting the original first-round S-box; performing exclusive-or operation on the back half part of first-round input data and a second mask, wherein an exclusive-or operation result is the front half part of first-round output data; in second to sixteenth rounds, substituting the original S-box with identical or different correction S-boxes, and determining a correction S-box according to a mask carried by a wheel key and a mask carried by the back half part of wheel input data in each round, wherein other algorithm flows are the same as a first-round algorithm flow; and performing exclusive-or operation on a result obtained after the execution of reverse initial permutation on sixteenth-round output, wherein the result of the exclusive-or operation is an output cipher text. Through the anti-power-attack method for the DES algorithm provided by the invention, power attacks 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 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 of t...

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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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