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Proceedings Paper

Second circuit of 2D feedback loop in ring interferometer as a way to high quality of cryptosystem
Author(s): Igor Valerevich Izmailov; Alexandr V. Lyachin; Boris Nikolaevich Poizner; Denis A. Shergin
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Paper Abstract

As it is known optical nonlinear ring interferometer (NRI) with Kerr media and two-dimensional feedback loop is an example of optical system, which is able to generate either regular optical structures or deterministic chaos. NRI can be used for encoding of messages. Authors suggest introduction of an additional feedback loop in NRI in order to improve so-called crypto stability. Mathematical models of optical field dynamics in NRI with additional feedback loop and in corresponding decipherer are developed. The NRI with additional feedback loop as a cipherer has the following advantages. Presence of two delay times (in feedback loops) provides unsuccessfulness of its cracking by means of correlation analysis. The cryptographic key length increases essentially due to increase of the interferometer's driving parameters number. For example it is parameters of large-scale transformation of optical field in cross-section of laser beam. These conclusions are illustrated by results of computer simulations of ciphering / deciphering procedure. The role of cipherer / decipherer parameters mismatch is investigated.

Paper Details

Date Published:
PDF: 11 pages
Proc. SPIE 5954, Optical Security Systems, 59540J; doi: 10.1117/12.624691
Show Author Affiliations
Igor Valerevich Izmailov, Tomsk State Univ. (Russia)
Alexandr V. Lyachin, Tomsk State Univ. (Russia)
Boris Nikolaevich Poizner, Tomsk State Univ. (Russia)
Denis A. Shergin, Tomsk State Univ. (Russia)

Published in SPIE Proceedings Vol. 5954:
Optical Security Systems
Zbigniew Jaroszewicz; Sergei Y. Popov; Frank Wyrowski, Editor(s)

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