Aleksandar Stojanovic, SQIG-IT
07/12/2012, 15:00 Room P5.18, Mathematics Building, IST.
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).
Quantum Computation and Information Seminar
Support: CAMGSD, CFIF, CFP and SQIG/IT with support from FCT and FEDER, namely via projects PTDC/EEA-TEL/103402/2008 QuantPrivTel and PEst-OE/EEI/LA0008/2011.