Strategy for cryptanalysis of optical encryption in the Fresnel domain.
Strategy for cryptanalysis of optical encryption in the Fresnel domain.
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DOI：
10.1364/ao.49.000457
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发表时间：
2010-01
期刊：
影响因子：
1.9
通讯作者：
G. Situ;G. Pedrini;W. Osten
中科院分区：
文献类型：
--
作者：
G. Situ;G. Pedrini;W. Osten
传统上，光学安全系统的密码分析试图找到原始密钥。通常，通过使用这种方法，可以在密钥空间中找到位于原始密钥附近的一组密钥。我们称这样的集合为原始密钥区域（ROK）。对于菲涅耳域中的光学加密系统，这种策略是无效的，因为它需要执行穷举搜索以确定系统几何形状或求解极大的系统方程组。我们建议采用另一种搜索策略：找到一个区域的可能的关键（RPK）。由于密码系统只有一个ROK，但有许多RPK，所以在RPK中找到密钥的概率将高于在ROK中找到密钥的概率。我们的分析表明，即使是基于菲涅尔的加密系统具有更大的密钥空间，但也有严重的安全问题需要解决。
Traditionally, cryptanalysis of optical security systems attempts to find original keys. Usually, by use of this kind of method, one can find a set of keys located close to the original keys in the key space. We call such a set the region of original key (ROK). For an optical encryption system in the Fresnel domain, such a strategy is ineffective since it needs to perform an exhaustive search to determine the system geometry or to solve an extremely large set of system equations. We propose to employ an alternative search strategy: to find a region of possible key (RPK). Since there is only one ROK for a cypher system but there are many RPKs, the probability to find a key in the RPK would be higher than in the ROK. Our analysis reveals that even a Fresnel-based encryption system has larger key space, but there are also serious security problems to be resolved.