Key-length analysis of double random phase encoding

裕之 鈴木, Hiroyuki (Chiba Univ.) Suzuki, 健 伊藤 +7 more

Fabián Mosso, Myrian Tebaldi, Roberto Torroba +1 more

Junxin Chen, Leo Yu Zhang, LI Jin-chang +1 more

Kazuya Nakano, Masafumi Takeda, Hiroyuki Suzuki

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.

Kazuya Nakano, Masafumi Takeda, Hiroyuki Suzuki +1 more

Although initial research shows that double-random phase encoding (DRPE) is vulnerable to known-plaintext attacks that use phase retrieval algorithms, subsequent research has shown that phase-only DRPE, in which the Fourier amplitude component of an image encrypted with classical DRPE remains constant, is resistant to attacks that apply phase retrieval algorithms. Herein, we numerically analyze the key-space of DRPE and investigate the distribution property of decryption keys for classical and phase-only DRPE. We determine the difference in the distribution property of successful decryption keys for these DRPE techniques from the numerical analysis results and then discuss the security offered by them.

라타아이샤액터