Title
Feedback-based collaborative secrecy encoding over binary symmetric channels
Document Type
Article
Publication Date
7-23-2012
Abstract
In this paper, we propose a feedback scheme for transmitting secret messages between two legitimate parties, over an eavesdropped communication link. Relative to Wyner's traditional encoding scheme, our feedback-based encoding often yields larger rate-equivocation regions and achievable secrecy rates. More importantly, by exploiting the channel randomness inherent in the feedback channels, our scheme achieves a strictly positive secrecy rate even when the eavesdropper's channel is less noisy than the legitimate receiver's channel. All channels are modeled as binary and symmetric. We demonstrate the versatility of our feedback-based encoding method by using it in three different configurations: the stand-alone configuration, the mixed configuration (when it combines with Wyner's scheme), and the reversed configuration. Depending on the channel conditions, significant improvements over Wyner's secrecy capacity can be observed in all configurations. © 1963-2012 IEEE.
Publication Source (Journal or Book title)
IEEE Transactions on Information Theory
First Page
5248
Last Page
5266
Recommended Citation
Amariucai, G., & Wei, S. (2012). Feedback-based collaborative secrecy encoding over binary symmetric channels. IEEE Transactions on Information Theory, 58 (8), 5248-5266. https://doi.org/10.1109/TIT.2012.2191478