Abstract
This paper presented a method for obtaining cryptographically strong substitution box (S-box) based on piecewise linear chaotic map (PWLCM). The cryptographical properties were analyzed , such as bijection, nonlinearity, strict avalanche, output bits independence and equiprobable input/output XOR distribution. The results of numerical analysis show that all the criteria for designing good S-box can be satisfied approximately and the proposed cryptosystem is a highly reliable system suitable for secure network communication.
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