ARQ-based secret key sharing

Mohamed Abdel Latif, Ahmed Sultan, Hesham El Gamal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations


This paper develops a novel framework for sharing secret keys using existing Automatic Repeat reQuest (ARQ) protocols. Our approach exploits the multi-path nature of the wireless environment to hide the key from passive eavesdroppers. The proposed framework does not assume the availability of any prior channel state information (CSI) and exploits only the one bit ACK/NACK feedback from the legitimate receiver. Compared with earlier approaches, the main innovation lies in the distribution of key bits among multiple ARQ frames. Interestingly, this idea allows for achieving a positive secrecy rate even when the eavesdropper experiences more favorable channel conditions, on average, than the legitimate receiver. In the sequel, we characterize the information theoretic limits of the proposed schemes, develop low complexity explicit implementations, and conclude with numerical results that validate our theoretical claims. ©2009 IEEE.
Original languageEnglish (US)
Title of host publicationIEEE International Conference on Communications
StatePublished - Nov 19 2009
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-22


Dive into the research topics of 'ARQ-based secret key sharing'. Together they form a unique fingerprint.

Cite this