计算机工程与应用 ›› 2007, Vol. 43 ›› Issue (29): 93-94.

• 学术探讨 • 上一篇    下一篇

一种度量图像置乱加密程度的新算法

范延军,孙燮华   

  1. 中国计量学院 计算机科学与技术系,杭州 310034
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-10-11 发布日期:2007-10-11
  • 通讯作者: 范延军

New algorithm to measure scrambling degree of scrambling images

FAN Yan-jun,SUN Xie-hua   

  1. Department of Computer Science and Technology,China Institute of Metrology,Hangzhou 310034,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-10-11 Published:2007-10-11
  • Contact: FAN Yan-jun

摘要: 近年来,出现了许多有效的图像置乱加密算法,但却很难找到一种关于置乱加密效果的有效度量方法。对度量置乱加密效果的方法进行了深入的探讨,进而提出了“置乱加密度”的概念,能够客观地反映置乱算法的加密性能,同时兼顾人类的视觉特性,是一种有效的度量方法。算法的执行过程如下:首先,将原始图像和置乱加密后的图像按照同样的方法分割为许多子块;第二步,对于原始图像中的每一块,求出它与置乱加密后的图像各个子块的最小“距离”;最后,给出了“置乱加密度”的定义,用来度量图像的置乱加密程度。实验结果证实了“置乱加密度”能有效地反映算法的置乱加密效果。

关键词: 排列变换, 加密, 置乱加密度

Abstract: In this paper,the methods to measure the scrambling degree of scrambling images are deeply discussed.Then,a new algorithm to measure the scrambling degree of scrambling images is proposed.The algorithm is as follows:first,devising the original image and the scrambling image to sub-block;second,calculating the distance of the according sub-block and get the result as the minimum value of eight valve situation.Finally,the definition of the scrambling degree is given.In order to evaluate the degree of the scrambling,we propose a new definition above it.The experiment results show that the scrambling degree is an efficient metrological method.

Key words: scrambling transformation, encryption, scrambling degree