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Proceedings Paper

Cryptographic schemes based on optical injection
Author(s): Valerio Annovazzi-Lodi; Silvano Donati; Alessandro Scire'; Marc Sorel
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Paper Abstract

We propose different schemes for secure data transmission based on synchronization of chaotic semiconductor lasers. The sources are driven to chaos by light injection either from another laser or from a mirror. Synchronization is obtained by implementing a master/slave configuration, i.e., by controlled injection of the emission of one chaotic system into the other. In a first basic scheme (masking) encryption consists in hiding a message by superposition of a chaotic waveform. An alternative and better scheme (Chaotic Shift Keying) consists in the digital modulation of a suitable parameter (such as the supply current) of the master laser, which is located at the transmission end. Because of the very complex chaotic pattern of the transmitted waveform, an eavesdropper cannot detect the incoming bit stream by conventional time or frequency domain methods (such as by using filters or correlators). On the other side, decryption can be performed by the authorized listener, which owns tuned copies of the chaotic system, by implementing a suitable synchronization scheme.

Paper Details

Date Published: 14 July 2000
PDF: 7 pages
Proc. SPIE 3944, Physics and Simulation of Optoelectronic Devices VIII, (14 July 2000); doi: 10.1117/12.391469
Show Author Affiliations
Valerio Annovazzi-Lodi, Univ. degli Studi di Pavia (Italy)
Silvano Donati, Univ. degli Studi di Pavia (Italy)
Alessandro Scire', Univ. degli Studi di Pavia (Italy)
Marc Sorel, Univ. degli Studi di Pavia (Italy)

Published in SPIE Proceedings Vol. 3944:
Physics and Simulation of Optoelectronic Devices VIII
Rolf H. Binder; Peter Blood; Marek Osinski, Editor(s)

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