We prove that the 1984 protocol of Bennett and Brassard (BB84) for quantum key distribution is secure. We first give a key distribution protocol based on entanglement purification, which can be proven secure using methods from Lo and Chau's proof of security for a similar protocol. We then show that the security of this protocol implies the security of BB84â€¦Â (More)

@article{Shor2000SimplePO,
title={Simple proof of security of the BB84 quantum key distribution protocol},
author={Shor and Preskill},
journal={Physical review letters},
year={2000},
volume={85 2},
pages={441-4}
}