Secret key generation through OFDM multipath channel

Author

Liu, Yanpei ; Draper, Stark C. ; Sayeed, Akbar M.

Author_Institution

Electr. & Comput. Eng., Univ. of Wisconsin, Madison, WI, USA

fYear

2011

fDate

23-25 March 2011

Firstpage

1

Lastpage

6

Abstract

We analyze the fundamental limits of key generation and describe an implementation based on error correcting codes. We show that key extraction based on channel coefficients significantly outperforms key extraction based on received signal strength indicators (RSSI). The development in this paper is based on an IEEE 802.11a orthogonal frequency-division multiplexing (OFDM) model and We demonstrate that it is feasible to use the sampled channel coefficients in OFDM as the key source. The key extraction problem is cast as a Slepian-Wolf coding and decoding problem. We construct regular and irregular forms of binary and non-binary low-density parity check (LDPC) codes to prototype our key extraction.

Keywords

OFDM modulation; binary codes; decoding; error correction codes; multipath channels; parity check codes; private key cryptography; wireless LAN; IEEE 802.11a; OFDM multipath channel; Slepian-Wolf coding; binary codes; channel coefficients; decoding problem; error correcting codes; key extraction; non-binary low-density parity check codes; orthogonal frequency-division multiplexing; received signal strength indicators; secret key generation; Frequency modulation; Multipath channels; Quantization; Common randomness; LDPC codes; OFDM channel; Slepian-Wolf decoder; secret key generation;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Sciences and Systems (CISS), 2011 45th Annual Conference on

Conference_Location

Baltimore, MD

Print_ISBN

978-1-4244-9846-8

Electronic_ISBN

978-1-4244-9847-5

Type

conf

DOI

10.1109/CISS.2011.5766103

Filename

5766103