A Randomized Space-Time Transmission Scheme for Secret-Key Agreement

摘要: In contrast to the pessimistic view on perfect secrecy, studies information-theoretic secrecy have shown that may be possible in practice. A typical example is Wyner’s wire-tap channel concept. However, existing approaches mostly depend unrealistic noise or error-rate assumptions. We propose a more practical way this paper which uses advanced space-time transmissions for enhanced information-theoretical secrecy. Based fundamental limits of MIMO blind identification, with proper randomization can effectively prevent adversary from estimation while allowing reliable transmission between authorized parties. The high error rate suffered by enhances secret capacity. This points out new and approach secret-key agreement achieves based physical-layer signal processing techniques.