# Information Bytes

Matthieu Bloch
School of Electrical and Computer Engineering
Georgia Institute of Technology

# Recent works

1. M. Tahmasbi and M. R. Bloch, “Covert Secret Key Generation with an Active Warden,” IEEE Transactions on Information Forensics and Security, vol. 15, pp. 1026–1039, Jun. 2020.

We investigate the problem of covert and secret key generation over a state-dependent discrete memoryless channel with one-way public discussion in which an adversary, the warden, may arbitrarily choose the channel state. We develop an adaptive protocol that, under conditions that we explicitly specify, not only allows the transmitter and the legitimate receiver to exchange a secret key but also conceals from the active warden whether the protocol is being run. When specialized to passive adversaries that do not control the channel state, we partially characterize the covert secret key capacity. In particular, the covert secret key capacity is sometimes equal to the covert capacity of the channel, so that secrecy comes “for free.”

@article{Tahmasbi2019,
author = {Tahmasbi, Mehrdad and Bloch, Matthieu R},
title = {Covert Secret Key Generation with an Active Warden},
journal = {IEEE Transactions on Information Forensics and Security},
year = {2020},
volume = {15},
pages = {1026-1039},
month = jun,
doi = {10.1109/TIFS.2019.2932906},
eprint = {1901.02044},
file = {:2020-Tahmasbi-IEEETransIFS.pdf:PDF},
groups = {Steganography and covert communications},
howpublished = {accepted to \emph{IEEE Transactions on Information Forensics and Security}}
}


2. A. Benevento, M. Santos, G. Notarstefano, K. Paynabar, M. Bloch, and M. Egerstedt, “Multi-Robot Coordination for Estimation and Coverage of Unknown Spatial Fields.” accepted to IEEE International Conference on Robotics and Automation, Feb. 2020.

@misc{Benevento2019,
author = {Benevento, Alessia and Santos, Mar\'ia and Notarstefano, Giuseppe and Paynabar, Kamran and Bloch, Matthieu and Egerstedt, Magnus},
howpublished = {accepted to \emph{IEEE International Conference on Robotics and Automation}},
month = feb,
title = {Multi-Robot Coordination for Estimation and Coverage of Unknown Spatial Fields},
year = {2020}
}


3. M. Tahmasbi and M. R. Bloch, “Steganography Protocols for Quantum Channels.” submitted to Journal of Mathematical Physics, Feb. 2020.

@misc{Tahmasbi2020a,
author = {Tahmasbi, Mehrdad and Bloch, Matthieu R},
howpublished = {submitted to \emph{Journal of Mathematical Physics}},
month = feb,
title = {Steganography Protocols for Quantum Channels},
year = {2020}
}


4. M. Tahmasbi and M. R. Bloch, “Towards Undetectable Quantum Key Distribution over Bosonic Channels.” submitted to IEEE Journal of Selected Topics in Information Theory, Feb. 2020.

@misc{Tahmasbi2020,
author = {Tahmasbi, Mehrdad and Bloch, Matthieu R.},
howpublished = {submitted to \emph{IEEE Journal of Selected Topics in Information Theory}},
month = feb,
title = {Towards Undetectable Quantum Key Distribution over Bosonic Channels},
year = {2020}
}