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Proceedings Paper

Optical digital chaos cryptography
Author(s): Álvaro Arenas-Pingarrón; Ana P. González-Marcos; José M. Rivas-Moscoso; José A. Martín-Pereda
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Paper Abstract

In this work we present a new way to mask the data in a one-user communication system when direct sequence - code division multiple access (DS-CDMA) techniques are used. The code is generated by a digital chaotic generator, originally proposed by us and previously reported for a chaos cryptographic system. It is demonstrated that if the user's data signal is encoded with a bipolar phase-shift keying (BPSK) technique, usual in DS-CDMA, it can be easily recovered from a time-frequency domain representation. To avoid this situation, a new system is presented in which a previous dispersive stage is applied to the data signal. A time-frequency domain analysis is performed, and the devices required at the transmitter and receiver end, both user-independent, are presented for the optical domain.

Paper Details

Date Published: 8 October 2007
PDF: 11 pages
Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410L (8 October 2007); doi: 10.1117/12.737789
Show Author Affiliations
Álvaro Arenas-Pingarrón, Univ. Politécnica de Madrid (Spain)
Ana P. González-Marcos, Univ. Politécnica de Madrid (Spain)
José M. Rivas-Moscoso, Univ. Politécnica de Madrid (Spain)
José A. Martín-Pereda, Univ. Politécnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 6741:
Optics and Photonics for Counterterrorism and Crime Fighting III
Colin Lewis, Editor(s)

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