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ABSTRACT: Chaos defined in general in quantitative characteristics is not a strict definition .In this paper two new chaos functions are proposed and theoretical proof about chaos is finished based on a strict Devaney definition. Using composite chaotic system character, a composite chaos sequences cipher algorithm is designed, which map have uniform distribution function and delta-like self-correlation, and can produce balance nature series to 0-1 after quantified. The unchanged probability of composite chaos makes ciphertext has a good random. As the sensitivity to initial condition and random nature to iterative function choice, key and plaintext and ciphertext form complex and sensitive nonlinear relations, and the correlation is very small. The leaking of ciphertext to key and plaintext information can effectively be prevented. The experimental result show that the system has a very high safety and the key space is expanded.
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on; 10/2007