%0 Journal Article
%T Secret Key Agreement by Soft-decision of Signals in Gaussian Maurer's Model
%A Masashi Naito
%A Shun Watanabe
%A Ryutaroh Matsumoto
%A Tomohiko Uyematsu
%J Mathematics
%D 2008
%I arXiv
%R 10.1587/transfun.E92.A.525
%X 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.
%U http://arxiv.org/abs/0804.2940v1