Abstract The paper deals with the problems of safety evaluation of a combined system, which consists of the cryptography and the safety codes applied in the safety communication layer within a safety-related system. In most cases the cryptography codes are combined with the safety codes which increase the performance of the cryptography system. In these applications it is very important to realise the optimisation of the selection of safety and cryptography codes parameters so that the probability of errors in the output of the cryptography decoder caused by electromagnetic interferences (EMI) will be under guaranteed safety integrity level (SIL). The main part of the paper presents the numerical results of an average probability of block cryptography codes used in praxis (block ciphers 2-DES, 3-DES, AES) with a combination of several code words lengths of safety block channel Hamming codes depending on the bit error rate (BER) of the noise communication channel.


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