摘要： 已有数字图像加密算法存在算法运行时间成本高及加密图像抗攻击性弱等问题。为此，提出一种基于位平面变换的数字图像加密算法。该算法将图像分解为若干位平面，通过定义一种混沌序列的新变换对图像位平面进行换位加密，从而置乱像素点位置，在位平面间增加密钥进行乱序处理实现图像像素点灰度值的变化。实验结果证明，该算法具有较大的密钥量，可以抵抗剪切攻击、噪声攻击、统计分析等多种攻击，且加解密速度较快。

关键词: 图像加密, 位平面, 序列变换, 位置混乱, 灰度值, 抗攻击性

Abstract: Aiming at the problem that existing digital image encryption algorithms have high operation time cost and the anti-attacking of the encrypted image is weak, a digital image encryption algorithm based on bit-plane transformation is proposed. This algorithm decomposes the image into a number of bit planes, and defines a new transform to achieve the pixel position scrambling by the plane transposed encryption, and achieves the change of the image pixel gray value by adding keys. Experimental results show that the image encryption algorithm has a larger amount of keys, and it can resist some attacks such as shear attack, noise attack, statistical analysis, and the speed of encryption and decryption is fast.

Key words: image encryption, bit-plane, sequence transformation, position scrambling, gray value, anti-attacking performance

中图分类号: 

• TP309