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Séminaire ICI : Keerthi Suria Kumar Arumugam

Titre du séminaire et orateur

Covert Communication over multi-user channels.

Keerthi Suria Kumar Arumugam (Georgia Tech, Atlanta).

Date et lieu

Mardi 12 décembre 2017.

ENSEA, salle 384.

Abstract

Secure communication is a transfer of information between terminals while satisfying constraints on the amount of nformation leaked to the eavesdroppers. Sometimes, a different version of security might be required, where terminals have to keep their status of communication secret from any monitoring adversaries (wardens). This type of communication is termed covert communication. This requirement to escape detection from a warden places a severe constraint on the type of codewords that can be used for information transfer. To remain undetected, covert communication schemes have to use extremely low-weight codewords, except in certain cases when the warden is uncertain about channel parameters. In short, generally, one can only send O(√n) bits over n channel uses. When covert communication needs to be achieved in communication networks with multiple transmitters or receivers, surprising problems arise providing opportunities to develop interesting insights. The talk will focus on three published works of mine - (i) covert communication over multiple-access channels, (ii) covert communication over broadcast channels, and (iii) Asynchronous covert communication.

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