一种基于六态量子密钥的图像加密算法

鉴于现有图像加密技术的局限性以及量子密钥分配方案的高度安全性,提出一种基于六态量子密钥的图像加密算法。在四态方案(BB84协议)两组共轭基的基础上,引入1对旋转测量基构成六态方案基矢空间;由六态方案产生随机的二进制密钥串,将密钥串与图像数据进行异或运算,对图像数据置换,实现图像的加密。实验结果与安全性分析表明:新算法密钥空间增大,可抵御穷举攻击;明密文相关度低,可有效抵御选择明文攻击;算法对密钥初始值敏感性强,安全性提高。

An Image Encryption Algorithm Based on Six-state Quantum Key

In view of the limitations of existing image encryption technique and high security of quantum key distribution scheme,an image encryption algorithm based on six-state quantum key distribution scheme is proposed.On the basis of two groups of conjugate bases of four states scheme （BB84 protocol）,another pair of rotating measuring bases are introduced to constitute six state base space; random binary key strings are generated with six-state scheme,then the key strings and image data are operated with XOR,and image data are replaced with the operation results.Experimental results and security analysis show that with the new algorithm key space increased,the brute force attack can be resisted; with lower relevancy of plaintext and cipher text,the chosen-plaintext attack can be effectively resisted; the algorithm achieves better sensitivity and security.