title: Evaluations of phase-only double random phase encoding based on key-space analysis.
abstract: 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.
authors: Global Scientific Information and Computing Center, Tokyo Institute of Technology, Tokyo, Japan. nakano.k.af@m.titech.ac.jp
authors: Kazuya
authors: K
authors: Nakano
authors: Masafumi
authors: M
authors: Takeda
authors: Hiroyuki
authors: H
authors: Suzuki
authors: Masahiro
authors: M
authors: Yamaguchi