Title :
Automatic Secret Keys From Reciprocal MIMO Wireless Channels: Measurement and Analysis
Author :
Wallace, Jon W. ; Sharma, Rajesh K.
Author_Institution :
Sch. of Eng. & Sci., Jacobs Univ. Bremen, Bremen, Germany
Abstract :
Information theoretic limits for random key generation in multiple-input multiple-output (MIMO) wireless systems exhibiting a reciprocal channel response are investigated experimentally with a new three-node MIMO measurement campaign. As background, simple expressions are presented for the number of available key bits, as well as the number of bits that are secure from a close eavesdropper. Two methods for generating secret keys are analyzed in the context of MIMO channels and their mismatch rate and efficiency are derived. A new wideband indoor MIMO measurement campaign in the 2.51- to 2.59-GHz band is presented, whose purpose is to study the number of available key bits in both line-of-sight and nonline-of-sight environments. Application of the key generation methods to measured propagation channels indicates key generation rates that can be obtained in practice for four-element arrays.
Keywords :
MIMO communication; cryptography; wireless channels; automatic secret keys; cryptography; frequency 2.51 GHz to 2.59 GHz; multiple-input multiple-output wireless systems; propagation channels; reciprocal MIMO wireless channels; three-node MIMO measurement campaign; Broadcasting; Communication system security; Information analysis; Information security; MIMO; Permission; Public key cryptography; Random processes; Wideband; Wireless sensor networks; Cryptography; MIMO; encryption; measurement; time varying channels;
Journal_Title :
Information Forensics and Security, IEEE Transactions on
DOI :
10.1109/TIFS.2010.2052253
