计算机科学 ›› 2023, Vol. 50 ›› Issue (6A): 220200121-6.doi: 10.11896/jsjkx.220200121
潘涛1, 佟晓筠1, 张淼1, 王翥2
PAN Tao1, TONG Xiaojun1, ZHANG Miao1, WANG Zhu2
摘要: 在医疗、军事、金融系统等需要传输重要图像的场景下,为了安全高效地传输图像,将图像进行压缩加密是一种行之有效的办法,图像经过压缩后传输可以减小传输开销,经过加密后也可以抵抗一些攻击者的攻击手段,保证了信息的安全性。基于压缩感知理论可以完成稀疏采样,超混沌系统能够为系统安全性提供保障。同时,文中还分析了超混沌系统的混沌特性,证明了该系统是混沌的且足够安全,超混沌系统生成的混沌序列还被用于构造测量矩阵,从而不必在传输过程中传输文本较大的矩阵,而只需要传输密钥即可。在压缩理论基础上还使用了置乱扩散操作,扩散采用了与明文相关的扩散操作,使图像安全性得到了很大提升,保障了数据安全。经过实验测试,图像的压缩加密效果较好,密钥空间大、对密钥足够敏感,说明所提方法能够抵抗暴力攻击、统计攻击等多种常用的攻击方法;在压缩比正常的情况下恢复得到的解密图像与原文图像在视觉上差距较小,甚至与原文图像相差无几,说明该算法重构质量较好,安全性较高。
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