The Secret Key Capacity of a Class of Noisy Channels with Correlated Sources

This paper investigates the problem of secret key generation over a wiretap channel when the terminals observe correlated sources. These sources are independent of the main channel and the users overhear them before the transmission takes place. A novel outer bound is proposed and, employing a previ...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2019-07, Vol.21 (8), p.732
Main Authors: Bassi, Germán, Piantanida, Pablo, Shamai (Shitz), Shlomo
Format: Article
Language:English
Subjects:
Communication
Correlated Sources
Electronic surveillance
Engineering Sciences
Information-Theoretic Security
Secret Key Agreement
Secret Key Capacity
Wiretap Channel
Wiretapping
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Summary:This paper investigates the problem of secret key generation over a wiretap channel when the terminals observe correlated sources. These sources are independent of the main channel and the users overhear them before the transmission takes place. A novel outer bound is proposed and, employing a previously reported inner bound, the secret key capacity is derived under certain less-noisy conditions on the channel or source components. This result improves upon the existing literature where the more stringent condition of degradedness is required. Furthermore, numerical evaluation of the achievable scheme and previously reported results for a binary model are presented; a comparison of the numerical bounds provides insights on the benefit of the chosen scheme.
ISSN:1099-4300
1099-4300
DOI:10.3390/e21080732