Double random phase encoding (DRPE) is a classical optical symmetric-key encryption method. DRPE prevents the key length from being determined because of its redundancy between encryption and decryption, unlike digital symmetric-key cryptographies. In our study, we numerically analyzed the key length of DRPE based on key-space analysis. We estimated the key length of DRPE by calculating the inverse value of the cumulative probability of the normal distribution that was estimated from samples of DRPE and then discuss security against brute-force attacks.
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CorrectionsKazuya Nakano, Masafumi Takeda, and Hiroyuki Suzuki, "Key-length analysis of double random phase encoding: publisher’s note," Appl. Opt. 56, 4917-4917 (2017)
18 May 2017: A correction was made to Table 3.
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