Software mask defense scheme capable of preventing attack on advanced encryption standard (AES) algorithm based on power analysis

Abstract

The invention discloses a software mask defense scheme capable of preventing attack on advanced encryption standard (AES) algorithm based on power analysis. The software mask defense scheme comprises steps of introducing a mask matrix M, and arranging three random mask defense points in each round of encryption operation; protecting the three mask defense points through a group of mask sequences generating M during each encryption; arranging a counter C in a crypto chip, superposing original values for each encryption, and finishing construction of the matrix M when the superposed value reaches the threshold value T1; when the superposed value reaches the threshold value T2, rearranging the counter C, updating the matrix M, and repeating the step over and over again. The three random mask defense points can perform mask defense on an important intermediate value calculated at least when few of subkeys are exhausted, therefore, high-order difference power attack can be effectively defended, and security of AES secret keys are protected. Furthermore, the mask matrix is updated through a queue mode, therefore, replacement frequency of random masks is reduced, and defense cost is reduced.

Description

technical field [0001] The invention relates to a software mask protection scheme for preventing attacks on AES algorithms based on power consumption analysis, in particular to a software mask protection scheme for preventing attacks on AES algorithms based on power consumption analysis, which can prevent smart cards from being attacked by an asymmetric random mask matrix. The power consumption attack of the AES algorithm implemented by the software in the medium, which improves the protection efficiency, belongs to the field of information security. Background technique [0002] Advanced Encryption Standard (AES), also known as Rijndael encryption method, is an encryption algorithm adopted by the US federal government. This standard is used to replace the original DES. It is by far the most widely used and popular in the world. A symmetric encryption algorithm. Although many encryption chips in China still use the DES algorithm, with the gradual popularization of sma...

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Problems solved by technology

[0011] Purpose of the invention: Aiming at the problems and deficiencies in the prior art, the present invention provides a software mask protection scheme to prevent attacks on the AES algorithm based on power consumption analysis, which can prevent power consumption attacks on the AES algorithm implemented by software in the smart card, especially The current mainstream correlation coefficient power consumption attack prevents the attacker from obtaining the AES key through this analysis method, thereby obtaining the sensitive information inside the smart card; at the same time, the design of the scheme also fully considers the encryption efficiency, and adopts the queue update mode to reduce the protection. cost;

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