Varieties of existing digital image encryption algorithms have been analyzed to seek a kind of digital image encryption algorithm with high security and low complexity of software/hardware implementation.ZUC algorithm is a stream cipher technique with high security for its three logic layers structure of linear feedback shift register (LFSR) , bit reorganization (BR) and nonlinear function (F).ZUC stream cipher allows a low power and low complexity of hardware implementation.What' s more, ZUC stream cipher is suitable for the encryption of digital image for its high speed of key stream generation.Finally, the ZUC stream cipher is implemented to encrypt the digital image.The encryption result shows that the ZUC stream cipher is effective for the digital image encryption.%分析了多种现有的数字图像加密算法,以寻求一种安全性高、软硬件实现简单的数字图像加密算法.祖冲之(ZUC)算法因其采用了线性反馈移位寄存器(LFSR),比特重组(BR)和非线性函数F的三层结构设计,极大地增强了该算法的安全性.而且,ZUC算法在设计时充分考虑了软硬件实现的复杂度,所以ZUC算法的软硬件实现开销较小,硬件实现功耗小.此外,由于ZUC算法流式产生密钥的快速实时性,非常适合用于数字图像的加解密.最后,将ZUC算法实现,并对数字图像进行加解密,取得了很好的加密效果.
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