基于混沌映射组合的高效图像加密新算法

New Efficient Algorithm of Image Encryption Based on Combined Chaotic Maps

提出了一种结合Logistic映射和标准混沌映射的混沌图像加密算法.由Logistic映射和标准混沌映射产生的混沌序列生成中间密钥,利用像素密文输出控制后继明文的加密密钥生成,使密文对明文具有敏感性.仿真结果表明,该密码系统的时间开销很小;密钥空间足以抵抗强力攻击;密文对明文或初始密钥的任何微小变化均有强烈敏感性;密文分布均匀,相邻像素满足零相关性.故该密码系统具有高安全性.

A new chaotic encryption algorithm based on combined Logistic map and standard chaotic map was proposed. The chaotic sequences randomly generated by the Logistic map and standard chaotic map were adopted to generate intermediate key. Then the generated ciphertext of encrypted pixels was used to control the generation of encryption key of successor plaintent to make the ciphertext sensitive to the plaintext, Simulation results showed that the proposed cryptosystem requires very little time to encrypt the plaintext. The key space is large enough to resist the brute-force attack. The ciphertext varies sensitively with any minimal changes of the initial secret key and the plaintext. For the encrypted image, the distribution of pixel-values has a random-like behavior and the values of adjacent pixels satisfy zero correlation, showing that the proposed scheme is of high reliability.