Protection method for side channel attack and fault attack

Abstract

The invention provides a protection method for side channel attack and fault attack. The protection method comprises the following steps of I. dividing operation of block cipher algorithm into a plurality of stages of pipelines; II. inputting real plaintext into two stages of pipelines selected at random, and inputting random number into other stages of pipelines; III. carrying out operation, and then comparing whether the operation results of the two real data are consistent after the operation is finished. The protection method can resist both side channel attack and fault attack, and has strong safety and high execution efficiency.

Description

technical field [0001] The invention relates to a method in the field of smart card chips, in particular to a protection method for side channel attacks and fault attacks. 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. Currently, the more popular block cipher algorithms include DES and AES. A block cipher algorithm is an algorithm for encrypting fixed-length plaintext. It groups the plaintext by a certain length, and encrypts the plaintext and the key to obtain the ciphertext. When decrypting, the ciphertext and key are restored to plaintext through decryption operation. [0003] With the advancement of measurement and analysis methods, various attack methods have also been ...

AI Technical Summary

Problems solved by technology

[0005] As a method of side channel attack, power analysis can only resist power consumption attack, but cannot resist fault attack.

To be able to resist both side-channel analysis and fault attacks, the existing technology needs to add other defense methods, which will take up more resources during implementation

Moreover, in the prior art, each circle operation of the symmetric algorithm is divided into several sub-steps. Generally speaking, the symmetric algorithm will contain multiple circle operations. If each circle operation is divided into several sub-steps, the efficiency will be very high when the algorithm is running. Low, it will take many clock cycles to complete an encryption / decryption operation

Images