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We introduce explicit schemes based on the polarization phenomenon for thetasks of one-way secret key agreement from common randomness and privatechannel coding. For the former task, we show how to use common randomness andinsecure one-way communication to obtain a strongly secure key such that thekey construction has a complexity essentially linear in the blocklength and therate at which the key is produced is optimal, i.e., equal to the one-waysecret-key rate. For the latter task, we present a private channel codingscheme that achieves the secrecy capacity using the condition of strong secrecyand whose encoding and decoding complexity are again essentially linear in theblocklength.

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