Cryptographic algorithm realization protecting method used for defending energy analysis attacks

Abstract

The invention discloses a cryptographic algorithm realization protecting method used for defending energy analysis attacks, and belongs to the field of information technology safety. According to the method, intermediate values of a cryptographic algorithm are protected through adding proper encoding and decoding steps to an execution process of the cryptographic algorithm. The method comprises the steps that firstly, before the algorithm, all data participating in the operation, including plain texts, secret keys and possible initial vectors, are encoded; afterwards, in the running process of the algorithm, cryptographic computing is conducted by using the encoded data and corresponding operations according to the steps of the cryptographic algorithm, so as to complete the encryption-decryption process; and finally, after the algorithm is finished, encoded result data are decoded, and normal output of the algorithm is obtained. The method has the advantages that only the intermediate values of the cryptographic algorithm are encoded, so as to guarantee that information is not leaked by the intermediate values; the input and the output of the algorithm are not changed, so that a running result of the algorithm is guaranteed to be accurate; and meanwhile, safety performance higher than that of a mask defense measure can be obtained, and the performance cost is lower.

Description

technical field [0001] The invention relates to a protection method for implementing a cryptographic algorithm, in particular to a protection method for implementing a cryptographic algorithm for defending against energy analysis attacks, and belongs to the field of information technology security. Background technique [0002] Energy analysis attack is a new method of cryptanalysis. Energy analysis attacks use the correlation between the energy consumption of cryptographic equipment to perform cryptographic operations and the operations performed by the equipment or the data processed to implement password cracking. It has the characteristics of low attack cost and high cracking efficiency. It has already attacked smart cards, RFID, etc. The security of embedded cryptographic devices poses serious real-world threats. Lightweight block ciphers are a class of block ciphers that are widely used in resource-constrained environments. The biggest feature of lightweight block ci...

AI Technical Summary

Problems solved by technology

For example, the implementation of masking technology requires a large time and space overhead, which is unrealistic for resource-constrained application environments

However, some more efficient hardware countermeasures, such as dual-rail precharge logic (Dual-rail Precharge Logic), have high design and deployment costs and difficulties in application.

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