Secure Degrees of Freedom of the Gaussian Wiretap Channel With Helpers and No Eavesdropper CSI: Blind Cooperative Jamming
Wyner introduced the wiretap channel in which a legitimate transmitter wants to have secure communications with a legitimate receiver in the presence of an eavesdropper, and determined its capacity-equivocation region for the degraded case. Csiszar and Korner extended this result to the general, not necessarily degraded, wiretap channel. Leung-Yan-Cheong and Hellman determined the capacity-equivocation region of the Gaussian wiretap channel. This line of research has been subsequently extended to many multi-user settings. Here, the authors are particularly interested in models with multiple independent legitimate transmitters, e.g., interference channel with confidential messages, interference channel with external eavesdroppers, multiple access wiretap channel, wiretap channel with helpers, and relay-eavesdropper channel with deaf helpers.