We propose a QKD protocol for trusted node relays. Our protocol shifts the communication and computational weight of classical post-processing to the end users by reassigning the roles of error correction and privacy amplification, while leaving the exchange of quantum signals untouched. We perform a security analysis for this protocol based on the BB84 protocol on the level of infinite key formulas, taking into account weak coherent implementations involving decoy analysis.
@article{arxiv.1408.4426,
title = {The Security of Quantum Key Distribution using a Simplified Trusted Relay},
author = {William Stacey and Razieh Annabestani and Xiongfeng Ma and Norbert Lütkenhaus},
journal= {arXiv preprint arXiv:1408.4426},
year = {2015}
}