International Journal of Applied Information Systems (IJAIS)
Speech is widely used in the people's daily life with cell phones and over the Internet, especially for long distance calls. Higher security for transmitting these data is required. Therefore an encryption scheme for the speech signal encryption based on combination of permutation and substitution are proposed in this paper. The permutation process is performed based on permutation key that generated from game of life matrix which is a simple cellular automaton, remarkable for its complex behavior.