An Encryption Algorithm Based on Chaotic Sequences

An improved encryption algorithm based on digital chaotic coding system is proposed. The problem of finite state is resolved by changing the parameter of chaotic mapping using m sequence. To further improve the random statistic property of output chaotic sequence, the chaotic sequence is made to transfer in various sub spaces. The output chaotic sequence through the perturbation function distributes uniformly in the whole state space. This method overcomes the disadvantage of limited precision, increases the period of output sequence and makes it measurable. This method can produce a private key with good statistic property and is easy to implement.