Secret-Key Sharing Based on Layered Broadcast Coding over Fading Channels

被引：3

作者：

Tang, Xiaojun ^{[1
]}

Liu, Ruoheng ^{[2
]}

Spasojevic, Predrag ^{[1
]}

Poor, H. Vincent ^{[2
]}

机构：

[1] Rutgers State Univ, WINLAB, Piscataway, NJ 08855 USA

[2] Princeton Univ, Princeton, NJ 08544 USA

来源：

2009 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY, VOLS 1- 4 | 2009年

基金：

美国国家科学基金会;

关键词：

INFORMATION;

D O I：

10.1109/ISIT.2009.5205823

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A secret-key sharing strategy based on layered broadcast coding is introduced for slow fading channels. In the model considered, Alice wants to share a key with Bob while keeping the key secret from a passive eavesdropper, Eve. Both Alice-Bob and Alice-Eve channels are assumed to undergo slow fading, and perfect channel state information (CSI) is assumed to be known only at the receivers during the transmission. Layered coding facilitates adapting the reliably decoded rate at Bob to the actual channel state without CSI available at Alice. The index of a reliably decoded layer is sent back to Alice via a public and error-free channel, which is exploited by Alice and Bob to generate the secret key. In this paper, the secrecy key rate is derived. In addition, the optimal power distribution over coded layers is characterized. It is shown that layered coding can increase the secrecy key rate significantly compared with single-level coding.

引用

页码：2762 / +

页数：2

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