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

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2 Author(s)
Wallace, J.W. ; Sch. of Eng. & Sci., Jacobs Univ. Bremen, Bremen, Germany ; Sharma, R.K.

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.

Published in:

Information Forensics and Security, IEEE Transactions on  (Volume:5 ,  Issue: 3 )

Date of Publication:

Sept. 2010

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