基于反色技术的概率可视分存方案  

Probabilistic visual cryptography scheme with reversing

作　　者：易枫[1] 王道顺[1] 李顺东[2] 戴一奇[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084 [2]北京师范大学信息科学与技术学院,北京100875

出　　处：《清华大学学报（自然科学版）》2008年第1期121-123,127,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(90304014)

摘　　要：为了减小可视分存方案中的像素膨胀m以及提高重构秘密图像的质量(使用相对差α衡量,0≤α≤1),基于反色可视分存方案和概率模型的可视分存方案构造出了(k,n)-反色概率可视分存方案。该方案采用(k,n)-概率可视分存方案得到没有像素膨胀的分存图,对每幅分存图通过反色可视分存方案进行处理后分发给每个参与者c幅分存图(c为正整数)。采用反色运算和OR运算可以重构原始密图,证明可得其相对差为1-(1-α)c,随着c的增大,重构密图的质量不断提高。该方案的像素膨胀是反色可视分存方案的像素膨胀的1/m;当c为1时,该方案是已有的概率可视分存方案。A （k,n） probabilistic visual cryptography scheme （VCS） with reversing was devoted to reduce the pixel expansion, m, and improve the quality of the reconstructed secret image （measured by the relative difference, 0 ≤ α≤ 1）. The scheme is based on reversing scheme and probabilistic scheme. This visual cryptography scheme obtains n shares without pixel expansion. After processing with reversing, c （c is a positive integer） shares are distributed to a participant. Reversing and OR operations are used to recover the original secret image with a relative difference of 1 - （1 - α）^c. Large values of c lead to improved reconstructed image quality. The pixel expansion of this scheme is 1/m of the scheme with reversing and is equal to the probabilistic scheme when c = 1.

关 键 词：数据安全 可视分存 秘密分存 秘密图像分存 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]