New Key Generation Algorithm based on Dynamical Chaotic Substitution Box

Through this paper, new key generation algorithm as pseudo-random number generator for block cipher cryptosystem is presented. In the proposed algorithm, a new dynamical substitution boxes (s-boxes) are created by using chebyshev chaotic map. Each s-box consists of 16×16 hexadecimal numbers where each row contains 16 different non-repeated hexadecimal numbers. A random choosing of two different rows from the created s-box is performed by using exponential chaotic map. These two selected rows are XORed to obtain 8 byte (64-bits) random numbers in reach iteration. The experimental results of NIST tests, statistical analysis and security analysis stated that the suggested generator can be used for generating secure and random sequence which can be used in cryptographic applications.