Outdoor secret key agreement scenarios using wireless MIMO fadingchannels

The method of key sharing between a mobile unit and a base station through a wirelessMIMO-based fading channel is investigated. The expressions to estimate the correct keybit agreement based on a quantization with the use of guard interval are proved. Thegenerated key sequences are tested on pseudo randomness and improved by applicationof some transforms. It provides that these key sequences pass all NIST tests. A leakageof information on the key to eavesdropper is estimated in terms of correlation betweensignals received by legal users and eavesdropper. The parameters of key distributionprotocol are optimized in order to maximized the key rate under the conditions of given probability key string agreement for legal users.