title: Security analysis of phase-only DRPE based on known-plaintext attack using multiple known plaintext-ciphertext pairs.
abstract: Classical double-random phase encoding (C-DRPE) is an optical symmetric-key encryption technique. C-DRPE is reported to be vulnerable to a known-plaintext attack (KPA) that uses a phase retrieval algorithm. However, although phase-only DRPE (PO-DRPE) is reported to be more resistant to KPAs than C-DRPE, it is not obvious yet that PO-DRPE is sufficiently resistant to a KPA under any condition, because the vulnerability to KPA varies depending on various factors, such as the number of the known plaintext-ciphertext pairs that are given for the KPA, or the gray level of the known-plaintext image (i.e., binary or multivalued image). In this paper, we investigate the resistance of C-DRPE and PO-DRPE to KPA under various conditions related to the number of known plaintext-ciphertext pairs and to the gray level of the known-plaintext image.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Nakano
authors.forename: Masafumi
authors.initials: M
authors.lastname: Takeda
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Suzuki
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamaguchi