Seminário de Computação e Informação Quântica 

07/12/2012, 15:00 — 16:00 — Sala P5.18, Pavilhão de Matemática
Aleksandar Stojanovic, SQIG-IT

Quantum authentication for quantum key distribution

In this talk I am going to present an approach based on the Wyner information-theoretical model. This model assumes that there is no preshared secret key. The main idea is that quantum resources can improve simultaneously the secrecy of the key generated by a pseudo-random number generator and the secrecy of the tag obtained with a hidden hash function (integrity control). As a result, quantum key distribution (QKD) becomes a fully quantum protocol. Most of my presentation is based on the article ‘‘Improving classical authentication over a quantum channel’’ (joint with F .M. Assis, P. Mateus and Y. Omar). This work solves the problem of quantum authentication of classical messages. The methodology that has been used is based on the no-cloning theorem and single-qubit transfer. One of the most important results of the paper is proposing an optimal authentication scheme for QKD that includes almost-fair random number generation (the result is hardware-independent).