Comparative Studies in Key Disagreement Correction Process on Wireless Key Agreement System.

This paper describes the comparison of the error-correcting codes that is adopted by the key disagreement correction process about wireless key agreement system called ESPARSKEY that is expected to achieve information-theoretic security. This system consists of AP with a variable directional antenna, that is, an ESPAR antenna, and UT with an omni-directional antenna. We employ conditional mutual information as the evaluation index. From experimental evaluation results, we clarified that the best way is adopting BCH(31,16,7) with table-aided soft-decision decoding as the key disagreement process where one eavesdropper exists more than 40cm from UT. After adopting this error-correcting code, we should transact 200 wireless packets between the nodes to share a 128-bit unguessable key against an eavesdropper. [ABSTRACT FROM AUTHOR]