基于控制符的混沌加密算法

Chaotic encryption scheme based on control character

针对Baptista型算法的一些不足,提出一种基于控制符的混沌加密算法。通过混沌迭代生成控制符,由控制符确定对明文的预处理方式,利用查找表加密预处理后的明文;同时,运用控制符不断更新查找表,使算法具有较高的安全性和较均匀的密文分布;另外,根据控制符不断改变混沌轨道,从某种程度上克服了数字混沌动力学特性的退化,进一步提高了算法的安全强度。最后,通过实验验证了算法的有效性。

To solve the drawbacks of Baptism-type chaotic cryptosystem, a chaotic scheme based on control character is introduced. Firstly, iterate the chaotic system, the control character is produced according to the chaotic state. The pretreatment to the plaintext is performed with the control character. Then the plaintext after pretreatment is encrypted by the look-up table. At the same time, the look-up table is updated according to the control character, which results in higher security and more uniform distribution of the ciphertext. Otherwise, the chaotic trajectory is changed continuously according to the control character, which enhances the security of the scheme ulteriorly. At last, analysis and experiments prove the validity of the scheme.