A key generation technique using array antenna beam selection

Abstract

Recently, secret key generation schemes for wireless communication systems using propagation performance are researched. RSSI, signal strength indications received at AP (Access Point) and UT (User Terminal) are same value in TDD systems because of reciprocity theorem, and are controlled by the array antenna pattern. However, RSSI at TP (Tapping Point) is not same as RSSI at AP or UT that depend on their location. The secret keys are generated from binarized RSSIs. This paper describes a method for improving the probability of key agreement between AT and UT by using array antennas control.