—The security of stream cipher, which is known as one of the main cipher techniques, is dependents completely on the quality of generated pseudo-stochastic sequences. Chaotic systems can produce the pseudo-random sequences with good randomness ， therefore, these systems are suitable to the stream cipher. In this paper, a new encryption algorithm is proposed by analyzing the principle of the chaos encryption algorithm based on logistic map. Moreover, the security and performance of the proposed algorithm is also estimated. The experimental results based on coupled chaotic maps approve the effectiveness of the proposed method, and the coupled chaotic maps shows advantages of large key space and high-level security. The ciphertext generated by this method is the same size as the plaintext and is suitable for practical use in the secure transmission of confidential information over the Internet.
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