Efficient One-Way Secret-Key Agreement and Private Channel Coding via Polarization

We introduce explicit schemes based on the polarization phenomenon for the task of secret-key agreement from common information and one-way public communication as well as for the task of private channel coding. Our protocols are distinct from previously known schemes in that they combine two practically relevant properties: they achieve the ultimate rate--defined with respect to a strong secrecy condition--and their complexity is essentially linear in the blocklength. However, we are not able to give an efficient algorithm for code construction.

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