Secrecy on the Physical Layer in Wireless Networks

To increase the spectral efficiency of future wireless networks, it is important to wisely integrate multiple services at the physical layer. Here we study the efficient integration of confidential services in bidirectional relay networks, where a relay node establishes a bidirectional communication between two other nodes using a decode-and-forward protocol. In the broadcast phase the relay transmits an additional confidential message to one node while keeping the other node completely ignorant of it. We use the concept of strong information theoretic security to ensure that the non-legitimate node cannot decode the confidential message no matter what its computational resources are. This results in the study of the bidirectional broadcast channel with confidential messages for which we establish the strong secrecy capacity region. 1 Notation: Discrete random variables are denoted by non-italic capital letters and their realizations and ranges by lower case letters and script letters, respectively; H(•) and I(•; •) are the traditional entropy and mutual information; P(•) denotes the set of all probability distributions; E[•] and P{•} are the expectation and the probability.

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Secrecy on the Physical Layer in Wireless Networks

Cited by 20 publications

References 17 publications

Secure degrees of freedom in cooperativeK-helper MIMO cognitive radio systems

Secure degrees of freedom in cooperativeK-helper MIMO cognitive radio systems

Beamforming for secrecy rate maximization under outage constraints and partial CSI

Strong secrecy in bidirectional relay networks

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