Cryptanalysis and security enhancement of optical cryptography based on computational ghost imaging
Cryptanalysis and security enhancement of optical cryptography based on computational ghost imaging
复制标题
基于计算鬼成像的光密码分析与安全增强
DOI：
10.1016/j.optcom.2015.12.013
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发表时间：
2016-04-15
影响因子：
2.4
通讯作者：
Li, Zhongyang
中科院分区：
文献类型：
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作者：
Yuan, Sheng;Yao, Jianbin;Li, Zhongyang
基于计算重影成像（CGI）的光密码术因其将明文加密为随机强度向量而不是复值函数而引起了研究人员的广泛关注。基于CGI的密码学的这一有前途的特性减少了要传输和存储的数据量，因此在实践中带来了方便。然而，我们发现由于加密系统的输入和输出之间的线性关系，这种密码体制容易受到选择明文攻击，本文提出了三种可行的破解策略。尽管这些攻击方法需要选择大量的明文，但这意味着这种密码学仍然存在安全隐患。为了避免这些攻击，利用可逆矩阵调制的安全增强方法进行了进一步的讨论，并通过数值模拟验证了可行性。(C)2015 Elsevier B.V.版权所有。
Optical cryptography based on computational ghost imaging (CGI) has attracted much attention of researchers because it encrypts plaintext into a random intensity vector rather than complexed-valued function. This promising feature of the CGI-based cryptography reduces the amount of data to be transmitted and stored and therefore brings convenience in practice. However, we find that this cryptography is vulnerable to chosen-plaintext attack because of the linear relationship between the input and output of the encryption system, and three feasible strategies are proposed to break it in this paper. Even though a large number of plaintexts need to be chosen in these attack methods, it means that this cryptography still exists security risks. To avoid these attacks, a security enhancement method utilizing an invertible matrix modulation is further discussed and the feasibility is verified by numerical simulations. (C) 2015 Elsevier B.V. All rights reserved.