A new stream ciphers based on hyperchaotic map

A new algorithm for generating pseudorandom-bit sequence from a single spatiotemporal chaotic system is proposed in this paper. A coupled map lattice is adopted as a prototype of a spatiotemporal chaotic system. Key streams are generated from the coupled map lattice by using simple algebraic computations, and then are used to encrypt plaintext via bitwise XOR. These make the cipher rather simple and efficient. The cryptographic properties of the pseudorandom-bit generator based on the coupled map lattice are analyzed which hurdles the shortcoming of mutual restriction between the successive values of the original hyperchaotic sequence. Finally, this paper presents analysis on the speed and security analysis. The results show that the new sequence can be a good candidate for constructing a secure cipher.