8 October 2007 Optical digital chaos cryptography
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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.
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Álvaro Arenas-Pingarrón, Ana P. González-Marcos, José M. Rivas-Moscoso, José A. Martín-Pereda, "Optical digital chaos cryptography", Proc. SPIE 6741, Optics and Photonics for Counterterrorism and Crime Fighting III, 67410L (8 October 2007); doi: 10.1117/12.737789; https://doi.org/10.1117/12.737789
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