Automatic Secret Keys From Reciprocal MIMO Wireless Channels: Measurement and Analysis

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...

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Bibliographic Details
Published in:IEEE transactions on information forensics and security 2010-09, Vol.5 (3), p.381-392
Main Authors: Wallace, J W, Sharma, R K
Format: Article
Language:English
Subjects:
Arrays
Broadcasting
Channels
Communication system security
Computer information security
Cryptography
encryption
Forensic engineering
Indoor
Information analysis
Information security
Keys
measurement
MIMO
Permission
Public key cryptography
Random processes
time varying channels
Wideband
Wireless sensor networks
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Summary: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.
ISSN:1556-6013
1556-6021
1558-6021
DOI:10.1109/TIFS.2010.2052253