Fault detection method and fault detection device for block cipher algorithm

Abstract

The invention discloses a fault detection method and a fault detection device for a block cipher algorithm. The method comprises steps: an operation round number of the block cipher algorithm is preset to be N, input data In are received, M rounds of operation are carried out on the data, and an operation result S1 is obtained; round operation is continuously executed on the S1 until N rounds of operation are completed, and an operation result Out is obtained; N-M rounds of inverse operation are executed on the Out to obtain an operation result S2; and the S1 and the S2 are compared, if the S1 is equal to the S2, no fault happens, and if the S1 is not equal to the S2, error information is returned. According to the fault detection method for the block cipher algorithm, corresponding rounds of inverse operation are executed after normal operation is completed, the inverse operation result and the normal operation middle result are compared whether to be equal, and whether fault injection happens during the operation process can be detected. A proper inverse operation round number can be selected according to application requirements, the design is convenient and flexible, and compared with the prior art, the method is small in increased cost and high in execution efficiency.

Description

technical field [0001] The invention relates to the technical field of chip detection, in particular to a fault detection method and device for a block cipher algorithm. Background technique [0002] With the development of computer and communication technology, especially with the wide application of the Internet, as well as the establishment and realization of personal communication, e-mail, and electronic automatic transfer payment systems, the issue of information security protection becomes more important. To solve this problem One of the most effective means is to use modern cryptographic techniques, resulting in the emergence of various cryptographic algorithms. Cryptographic algorithms can be divided into symmetric cryptographic algorithms and asymmetric cryptographic algorithms. Symmetric cryptographic algorithms use the same key for encryption and decryption or there is a simple, easy-to-calculate mutual push relationship between the encryption and decryption keys....

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor execution efficiency when block cipher algorithms are resistant to faults in the prior art, the present invention proposes a fault detection method and device for block cipher algorithms

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