Name
Abstract | ||
|---|---|---|
The ability to exchange keys between users is vital in any wireless based security system. A key generation technique which exploits the randomness of the wireless channel is a promising alternative to existing key distribution techniques, e.g., public key cryptography. In this paper, a secure key generation scheme based on the subcarriers' channel responses in orthogonal frequency-division multiplexing (OFDM) systems is proposed. We first implement a time-variant multipath channel with its channel impulse response modelled as a wide sense stationary (WSS) uncorrelated scattering random process and demonstrate that each subcarrier's channel response is also a WSS random process. We then define the X% coherence time as the time required to produce an X% correlation coefficient in the autocorrelation function (ACF) of each channel tap, and find that when all the channel taps have the same Doppler power spectrum, all subcarriers' channel responses has the same ACF as the channel taps. The subcarrier's channel response is then sampled every X% coherence time and quantized into key bits. All the key sequences' randomness is tested using National Institute of Standards and Technology (NIST) statistical test suite and the results indicate that the commonly used sampling interval as 50% coherence time cannot guarantee the randomness of the key sequence. |
Year | DOI | Venue |
|---|---|---|
2014 | 10.1109/GLOCOMW.2014.7063613 | GLOBECOM Workshops |
Keywords | Field | DocType |
ofdm subcarriers,orthogonal frequency-division multiplexing,wireless based security system,nist statistical test,autocorrelation function,time-variant multipath channel,ofdm modulation,wide sense stationary,key generation technique,doppler power spectrum,wireless channel,national institute of standards and technology,wireless channels,uncorrelated scattering random process,wss random process,secure key generation,transient response,public key cryptography,channel responses,subcarrier channel responses,telecommunication security,ofdm systems,channel impulse response,key distribution techniques | Subcarrier,Key distribution,Key generation,Computer science,Computer network,Communication channel,Multiplexing,Public-key cryptography,Orthogonal frequency-division multiplexing,Coherence time | Conference |
ISSN | Citations | PageRank |
2166-0069 | 11 | 0.54 |
References | Authors | |
15 | 4 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Junqing Zhang | 1 | 200 | 17.82 |
| Alan Marshall | 2 | 225 | 28.87 |
| R.F. Woods | 3 | 291 | 45.11 |
| Trung Q. Duong | 4 | 2911 | 171.22 |