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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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Steganographic fiber-optic transmission using coherent spectral-phase-encoded optical CDMA

Wu, B. and Agrawal, A. and Glesk, I. and Narimanov, E. and Etemad, S. and Prucnal, P.R. (2008) Steganographic fiber-optic transmission using coherent spectral-phase-encoded optical CDMA. In: Lasers and Electro-Optics, 2008 and 2008. Conference on Quantum Electronics and Laser Science. IEEE, pp. 1-2. ISBN 978-1-55752-859-9

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Abstract

Spread spectrum (SS) has been used extensively in military radio communications to ensure low probability of intercept of a transmitted signal by an unintended receiver. Low probability of intercept is achieved using a unique code to spread the transmitted signal into noise-like signal having low spectral power density. The SS signal is submerged below the background noise, making it difficult to be detected by a hostile eavesdropper. Low probability of intercept is ensured because the original signal can only be recovered if the receiver knows the spreading code. The application of SS techniques in radio frequency wireless communications has been widely implemented using code-division multiple-access (CDMA), which provides both high spectral efficiency and steganographic security, , where only an authorized user knows of the existence of the secret message.