On secure signaling for the Gaussian multiple access wire-tap channel

Ender Tekin, Semih Şerbetli, Aylin Yener

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    35 Scopus citations

    Abstract

    We consider the Gaussian Multiple Access Wire-Tap Channel (GMAC-WT) where multiple users communicate with the intended receiver in the presence of an intelligent and informed wire-tapper (eavesdropper). The wire-tapper receives a degraded version of the signal at the receiver. We assume that the wire-tapper is as capable as the intended receiver, and there is no other shared secret key. We consider two different secure communication scenarios: (i) keeping the wire-tapper totally ignorant of the message of any group of users even if the remaining users are compromised, (ii) using the secrecy of the other users to ensure secrecy for a group of users. We first derive the outer bounds for the secure rate region. Next, using Gaussian codebooks, we show the achievability of a secure rate region for each measure in which the wire-tapper is kept perfectly ignorant of the messages. We also find the power allocations that yield the maximum sum rate, and show that upper bound on the secure sum rate can be achieved by a TDMA scheme. We present numerical results showing the new rate region and compare it with that of the Gaussian Multiple-Access Channel (GMAC) with no secrecy constraints.

    Original languageEnglish (US)
    Title of host publicationConference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers
    Pages1747-1751
    Number of pages5
    StatePublished - Dec 1 2005
    Event39th Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
    Duration: Oct 28 2005Nov 1 2005

    Publication series

    NameConference Record - Asilomar Conference on Signals, Systems and Computers
    Volume2005
    ISSN (Print)1058-6393

    Other

    Other39th Asilomar Conference on Signals, Systems and Computers
    CountryUnited States
    CityPacific Grove, CA
    Period10/28/0511/1/05

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    All Science Journal Classification (ASJC) codes

    • Signal Processing
    • Computer Networks and Communications

    Cite this

    Tekin, E., Şerbetli, S., & Yener, A. (2005). On secure signaling for the Gaussian multiple access wire-tap channel. In Conference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers (pp. 1747-1751). [1600069] (Conference Record - Asilomar Conference on Signals, Systems and Computers; Vol. 2005).