应用科学学报 ›› 2019, Vol. 37 ›› Issue (5): 631-642.doi: 10.3969/j.issn.0255-8297.2019.05.005

• 多媒体信息安全 • 上一篇    下一篇

基于位平面-块置乱的图像加密算法安全性分析

屈凌峰, 陈帆, 和红杰, 袁源   

  1. 西南交通大学 信息科学与技术学院, 成都 610031
  • 收稿日期:2019-07-30 修回日期:2019-08-01 出版日期:2019-09-30 发布日期:2019-10-18
  • 通信作者: 陈帆,副教授,研究方向:数字图像处理,E-mail:Fchen@swjtu.edu.cn. E-mail:Fchen@swjtu.edu.cn
  • 基金资助:
    国家自然科学基金(No.61872303,No.61461047);四川省科技厅科技创新人才计划(No.2018RZ0143);四川省科技创新创业苗子工程重点项目(No.19MZGC0163)资助

Security Analysis of Image Encryption Algorithm Based on Bit Plane-Pixel Block Scrambling

QU Lingfeng, CHEN fan, HE Hongjie, YUAN yuan   

  1. College of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2019-07-30 Revised:2019-08-01 Online:2019-09-30 Published:2019-10-18

摘要: 针对基于阿诺德变换的加密算法(Arnold transform-based encryption method,ATBEM)提出一种基于图像块均方根的已知明文攻击方法.首先利用加密前后明文图像0、1分布比例不变的特征估计出位平面置乱顺序,恢复原始像素的值;然后根据块置乱和块内像素置乱保持像素值恒定不变的特性,定义图像块均方根特征以查找和估计块置乱矩阵.分析讨论了图像块置乱加密的安全性能,结果表明:对于图像块置乱加密,图像越平滑分块越小,破解所需的明密文对数越多,已知明文攻击难度越大.实验结果验证了图像纹理越复杂,攻击效果越好,在分块大小为2×2的条件下,攻击者仅需已知一对明文-密文对即可破解块置乱加密50%以上的图像内容,因此ATBEM加密算法难以抵抗所提出的已知明文攻击.

关键词: 加密域可逆信息隐藏, 图像块均方根, 已知明文攻击, 位平面-块置乱加密

Abstract: In this paper, a known plaintext attack method based on the root mean square (RMS) of image block is proposed for ATBEM. Firstly, the scrambling sequence of bit planes is estimated to restore the original pixel value by using the invariant distribution ratio of 0 and 1 of plaintext images before and after encryption. Then, according to the characteristics of block scrambling and intra-block scrambling, which keeps the pixel value constant, a root mean square (RMS) feature of image block is defined to find and estimate the block scrambling matrix. The security performance of image block scrambling encryption is analyzed and discussed. The analysis results show that the smoother the image is, the smaller the blocks are, the more plaintext logarithms are needed to crack, and the more difficult the known plaintext attack is. Experimental results verify that the more texture the image is, the better the attack effect is. Under the condition of 2×2 block size, the attacker can crack more than 50% of the ciphertext image content with only one pair of known plaintext-ciphertext pairs known. And ATBEM encryption algorithm is difficult to resist the proposed known plaintext attack.

Key words: reversible data hiding in encrypted image, image block root mean square (RMS), known plaintext attack, bit plane-block scrambling

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