Технический перевод 60 000 знаков, 52 стр. (специализация: сети связи и системы коммутации).Experimental Quantum Cryptography
Charles H. Bennett
We describe results from an apparatus and protocol designed to implement quantum key distribution, by which two users, who share no secret information initially: 1)exchange a random quantum transmission, consisting of very faint flashes of polarized light; 2) by subsequent public discussion of the sent and received versions of this transmission estimate the extent of eavesdropping that might have taken place on it, and finally 3) if this estimate is small enough, distill from the sent and received versions a smaller body of shared random information, which is certifiably secret in the sense that any third party’s expected information on it is an exponentially small fraction of one bit. Because the system depends on the uncertainty principle of quantum physics, instead of usual mathematical assumptions such as the difficulty of factoring, it remains secure against an adversary with unlimited computing power.The IP Multimedia Subsystem in Next Generation Networks
Gilles Bertrand
May 30, 2007
The IP multimedia Subsystem (IMS) is a network functional architecture that is seen as a promising solution for facilitating multimedia service creation and deployment, as well as supporting interoperability and network convergence. IMS allows network operators to play a central role in traffic distribution, therefore being more than bit pipes. For all these reasons, IMS has generated intense research and standardization efforts. The aim of this paper is to present the overall IMS architecture and protocols, as well as the related stakes.
Keywords: IP Multimedia Subsystem, Quality of Service
