Achieving secrecy capacity of the wiretap channel and broadcast channel with a confidential component

We show that capacity of the general (not necessarily degraded or symmetric) wiretap channel under a “strong secrecy constraint” can be achieved using an explicit scheme based on polar codes.

We also extend our construction to the case of broadcast channels with confidential messages defined by Csiszár and Körner, achieving the entire capacity region of this communication model. This submission is an extended abstract of the paper by the same authors (see arXiv:1410.3422).