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Widely-deployed encryption-based security prevents unauthorized decoding, butdoes not ensure undetectability of communication. However, covert, or lowprobability of detection/intercept (LPD/LPI) communication is crucial in manyscenarios ranging from covert military operations and the organization ofsocial unrest, to privacy protection for users of wireless networks. Inaddition, encrypted data or even just the transmission of a signal can arousesuspicion, and even the most theoretically robust encryption can often bedefeated by a determined adversary using non-computational methods such asside-channel analysis. Various covert communication techniques were developedto address these concerns, including steganography for finite-alphabetnoiseless applications and spread-spectrum systems for wireless communications.After reviewing these covert communication systems, this article discusses newresults on the fundamental limits of their capabilities, as well as provides avision for the future of such systems.

Hiding Information in Noise: Fundamental Limits of Covert Wireless Communication