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).
Please note exceptional room.