摘要： 提出了一种对图像信号进行时空两级加密的方法。在时序加密级，采用混沌序列作为AES加密的初始密钥，既保留了AES作为常规加密算法的优良特性，又方便了密钥的产生和管理。在空间置换加密级，给出了一种将混沌序列转换为空间置换矩阵的新方法。混沌序列由参数受调的logistic映射产生，避免了混沌迭代进入短周期效应。实验结果表明加密图像效果良好，解密图像无损伤。

关键词: AES加密, logistic混沌序列, 图像置换, 图像加密

Abstract:

This paper presents a composite spatial-temporal approach to image encryption. In the temporal domain, chaotic series acts as a key for the AES encryption. It generates and administers its key without compromising any of its nice features. In the spatial domain, the paper presents a new way of deriving a space transform matrix by chaotic series. The chaos series is generated by the logistic equation, whose parameters are modulated. Therefore, short cycles are avoided in the solution sequence of the chaotic system. Experimental results confirm the effectiveness of the proposed method. Also, there is no damage to the decrypted image.

Key words: AES, logistic chaotic series, image transform, image encryption

中图分类号: 

• TP309