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Entropy 2014, 16(4), 2105-2130; doi:10.3390/e16042105

Wiretap Channel with Information Embedding on Actions

Electronic Engineering Department, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, China
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Received: 11 November 2013 / Revised: 28 March 2014 / Accepted: 10 April 2014 / Published: 14 April 2014

Abstract

Information embedding on actions is a new channel model in which a specific decoder is used to observe the actions taken by the encoder and retrieve part of the message intended for the receiver. We revisit this model and consider a different scenario where a secrecy constraint is imposed. By adding a wiretapper in the model, we aim to send the confidential message to the receiver and keep it secret from the wiretapper as much as possible. We characterize the inner and outer bounds on the capacity-equivocation region of such a channel with noncausal (and causal) channel state information. Furthermore, the lower and upper bounds on the sum secrecy capacity are also obtained. Besides, by eliminating the specific decoder, we get a new outer bound on the capacity-equivocation region of the wiretap channel with action-dependent states and prove it is tighter than the existing outer bound. A binary example is presented to illustrate the tradeoff between the sum secrecy rate and the information embedding rate under the secrecy constraint. We find that the secrecy constraint and the communication requirements of information embedding have a negative impact on improving the secrecy transmission rate of the given communication link.
Keywords: information embedding; wiretap channel; action-dependent states; sum secrecy capacity information embedding; wiretap channel; action-dependent states; sum secrecy capacity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Yin, X.; Xue, Z. Wiretap Channel with Information Embedding on Actions. Entropy 2014, 16, 2105-2130.

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