title: Comment on "Interferometric phase-only optical encryption system that uses a reference wave".
abstract: We explain the vulnerability of the phase-only encryption procedure suggested by Seo and Kim [Opt. Lett. 28, 304 (2003)] and clarify issues regarding its robustness and degree of security compared with those of a previously reported phase-only encryption method.
authors.affiliation: Optics and Fluid Dynamics Department, Risø National Laboratory, DK-4000 Roskilde, Denmark. jesper.gluckstad@risoe.dk
authors.forename: Jesper
authors.initials: J
authors.lastname: Glückstad
authors.forename: Vincent R
authors.initials: VR
authors.lastname: Daria
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Rodrigo