基于DNA编码和超混沌系统的图像加密算法

针对DNA编码规则单一和混沌加密算法对密钥的灵敏度低等问题,提出一种基于DNA编码和超混沌系统的图像加密方案。该算法首先使用SHA-3算法计算明文图像的哈希值,用于超混沌系统的初始值,增加明文敏感性;其次将图像转换为DNA序列,并与所构建的S盒子进行DNA序列运算;最后用超混沌系统产生的序列对图像进行置乱。结果和理论分析表明,该算法不仅提高了密钥敏感性和传输数据的安全性,而且具有较好的抗穷举攻击、统计攻击和差分攻击能力。

Image encryption algorithm based on DNA encoding and hyper-chaotic system

Aiming at the deficiency of the single DNA encoding rule and chaotic encryption algorithm has low sensitivity to key. This paer proposed an image encryption algorithm based on DNA encoding and hyper-chaotic system. Firstly, the algorithm used the SHA-3 algorithm to calculate the hash value of the plaintext image, which used for the initial value of the hyper-chaotic system and increases the sensitivity of plaintext. Secondly, the it converted image into DNA sequence and performed the DNA sequence operation with the constructed S-box. Finally, it scrambled the image by the sequence produced by hyper-chaotic system. The simulation results and theoretical analysis show that the algorithm improves the sensitivity of key and the security of data transmission, and has better ability of anti-exhaustive attack, statistical attack and differential attack.