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Quantum steganography over noisy channels

Thursday September 27, 2018
3:30 pm

 Presenter:  Todd Brun, University of Southern California
 Series:  CQuIC Seminars
 Abstract:  Steganography is the science or art of hiding secret messages by embedding them within seemingly innocent communications. We examine the protocol of quantum steganography using error-correcting codes: hiding a quantum state in a codeword by disguising it as channel noise. The sender and receiver are assumed to share a secret key. We show that if the eavesdropper lacks perfect knowledge of the channel, the sender and receiver can communicate secretly at a constant rate. Even if the eavesdropper has perfect knowledge of the channel, an arbitrary amount of quantum information can be sent. We put asymptotic bounds on the rate of communication and the rate of key consumption both when the true underlying channel is noiseless and for certain noisy channels, and examine the distinction between secret and secure communications. We also compare these results to recent work on quantum covert communication.
 Host:  Carlton Caves
 Location:  Room 190, Physics & Astronomy

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