01/06/2012, 15:00 — 16:00 — Sala P4.35, Pavilhão de Matemática
Arnaldo Gouveia, SQIG - IT
An overview of the E91 protocol
In the current Quantum Key Distribution (QKD) proposals it is
possible to generate a secret key and distribute it with the
involved parties separated in physical terms. This possibility
opens the possibility of structuring a solution to the classical
cryptography problem of key distribution with reduced interaction
among involved parties. Among other proposals to address this issue
is the Eckert 91 protocol which will be in the scope of this
report. Proposed in 1991 by A. Eckert it is an entanglement based
protocol. The security assurance of entanglement based protocols is
based on the impossibility of an eavesdropper to clone a message
without destroying it. As such the receiver has the possibility to
detect eavesdropping and this is a major advantage of this type of
protocols. In the end a security proof will be described.
Apoiado por: Phys-Info (IT), SQIG (IT), CeFEMA e CAMGSD, com financiamento de FCT, FEDER and EU FP7, especificamente via o Doctoral Programme in the Physics and Mathematics of Information (DP-PMI), os projectos estratégicos FCT PEst-OE/EEI/LA0008/2013 e UID/EEA/50008/2013, o projecto IT QuSim, o projecto CRUP-CPU CQVibes, a Acção de Coordenação FP7 QUTE-EUROPE (600788) e os projectos FP7 Landauer (GA 318287) e PAPETS (323901).