A STREAM CIPHER BASED ON A SPATIOTEMPORAL CHAOTIC SYSTEM

A stream cipher based on a spatiotemporal chaotic system is proposed. A one-way coupled map lattice consisting of r-adic maps is served as the spatiotemporal chaotic system. Multiple keystreams are generated from the coupled map lattice by using simple algebraic computations, and then are used to encrypt plaintext via bitwise XOR. Numerical investigation shows that the statistical properties of the generated keystream are satisfactory. Security analysis and evaluation of encryption speed indicate that the cipher has high security, high efficiency and low computation expense.