Secret Key Agreement by Soft-decision of Signals in Gaussian Maurer's Model

Details Secret Key Agreement by Soft-decision of Signals in Gaussian Maurer's Model Secret Key Agreement by Soft-decision of Signals in Gaussian Maurer's Model

2008-04-18

arxiv.org/abs/0804.2940v1

IEICE Trans. Fundamentals, vol. 92, no. 2, pp. 525-534, February 2009

Computer Science

Information Theory

10 pages, 4 figures, to be appear in Proc. of 2008 IEEE International Symposium on Information Theory in Toronto, Canada

Scientific paper

10.1587/transfun.E92.A.525

We consider the problem of secret key agreement in Gaussian Maurer's Model. In Gaussian Maurer's model, legitimate receivers, Alice and Bob, and a wire-tapper, Eve, receive signals randomly generated by a satellite through three independent memoryless Gaussian channels respectively. Then Alice and Bob generate a common secret key from their received signals. In this model, we propose a protocol for generating a common secret key by using the result of soft-decision of Alice and Bob's received signals. Then, we calculate a lower bound on the secret key rate in our proposed protocol. As a result of comparison with the protocol that only uses hard-decision, we found that the higher rate is obtained by using our protocol.

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