Secure key agreement over reciprocal fading channels in the low SNR regime

• We study the low SNR scaling of the non-coherent secret-key agreement capacity over a reciprocal, block-fading channel. For the restricted class of strategies, where one of the nodes is constrained to transmit pilot-only symbols, we show that the secret-key capacity scales as SNR ·log T if T ≤ 1/SNR, where T denotes the coherence period, and as SNR·log(1/SNR) otherwise. Our upper bound is inspired by the genie-aided argument of Borade and Zheng (IT-Trans 2010). Our lower bound is based on bursty communication, channel training, and secret message transmission.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Block fading channel

Channel trainings

Key agreement

Low-snr regimes

Lower bounds

Secret messages

Secret-key agreements

Upper Bound

Fading channels

Signal processing

Testbeds

Wireless telecommunication systems

Signal to noise ratio

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)