关键词: 超混沌, 图像加密, 选择明文攻击, 密码分析

Abstract: According to the principle of chosen plaintext attack, a novel hyperchaotic image encryption scheme is analysed, and the results show that the image encryption scheme can not resist against chosen plaintext attack. An improved algorithm is proposed based on hyperchaos and the performance analysis as well as experimental tests are performed. The theoretical analysis and experimental results indicate that the improved algorithm can overcome these flaws and has better cryptographic performances in statistical characteristics, difference characteristics and speed of encryption.

Key words: hyperchaos, image encryption, chosen plaintext attack, cryptanalysis