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Fault attack is a very effective way to crack the key for cipher chip. Among existing fault attack countermeasures, the infection countermeasures are very effective means, but, most existing infection countermeasures are based on the single fault assumption, and the accuracy of fault injections has significantly improved in the late years, it has become possible to implementation of double fault attacks in specific circuit regions, and it is, therefore, flawed in the resistance to double fault attacks. Aim at the flawed mentioned, this paper proposes a countermeasure called random infection mechanism to resist fault attacks. We use the encryption/decryption circuit to construct the fault diffusion pattern and avoid under the possibility of double error attacks. Furthermore, in order to against single byte fault attacks, we introduce random numbers to make the fault diffusion randomization. Experiments are carried out to verify the proposed algorithm and the results show that the proposed random infection mechanism can resist fault attacks effectively including single byte error attacks.

Against fault attacks based on random infection mechanism