An objective visual security assessment for cipher-images based on local entropy

An objective visual security assessment for cipher-images based on local entropy
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基于局部熵的密码图像客观视觉安全评估

DOI:
10.1007/s11042-010-0491-5
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发表时间:
2011-05
影响因子:
3.6
通讯作者:
Xu, Zhengquan
Xu, Zhengquan
中科院分区:
计算机科学4区
文献类型:
--
作者:
Yao, Ye;Liu, Jin;Sun, Jing;Xu, Zhengquan

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近年来,人们提出了许多实用的图像和视频加密算法。对这些加密算法的安全性分析主要集中在密码学安全性的研究上,而对视觉安全性的研究较少。视觉安全意味着加密的视频内容是人类视觉无法理解的。加密算法提供的视觉安全性越高,攻击者从密文图像中获得的信息越少,攻击的难度就越大。因此,密文图像的视觉安全性评价是视觉媒体安全性评价的一个重要指标。到目前为止,针对密文图像的视觉安全性评估的系统研究还远远不够。此外,目前还没有提出实用的视觉安全客观指标或评价方法。根据图像信息熵在加密图像和原始图像之间的变化,提出了一种基于局部熵的视觉安全评估算法。实验结果表明,该方案能够提供与主观评估相匹配的有效的客观评估,也适用于其他选择性加密算法的安全评估。
In recent years, many practical algorithms have been put forward for images and videos encryption. Security analysis on these encryption algorithms focuses research on cryptographic security, and few work relate to visual security. Visual security means that the encrypted video content is unintelligible to human vision. The higher visual security the encryption algorithm can provide, the less information an attacker from the cipher-images to obtain, the greater the difficulty of attack is. Therefore, visual security assessment for cipher-images is a very important indicator in security evaluation of visual media. So far, systematic research on visual security assessment for cipher-images is far from enough. Moreover, there are no practical objective indicators or evaluation methods on visual security have been proposed at present. According to the changes on image information entropy between cipher-images and original images, we present a visual security assessment algorithm based on local entropy. The experiments result shows that the scheme can provide an efficient objective assessment which is match up to subjective assessment, and is also suitable for security assessment of other selective encryption algorithms.
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