On the Shannon Cipher System With a Wiretapper Guessing Subject to Distortion and Reliability Requirements

In this paper we discuss the processes in the Shannon cipher system with discrete memoryless source and a guessing wiretapper. The wiretapper observes a cryptogram of $N$-vector of ciphered messages in the public channel and tries to guess successively the vector of messages within given distortion level $\Delta$ and small probability of error less than $\exp \{-NE\}$ with positive reliability index $E$. The security of the system is measured by the expected number of guesses which wiretapper needs for the approximate reconstruction of the vector of source messages. The distortion, the reliability criteria and the possibility of upper limiting the number of guesses extend the approach studied by Merhav and Arikan. A single-letter characterization is given for the region of pairs $(R_L,R)$ (of the rate $R_L$ of the maximum number of guesses $L(N)$ and the rate $R$ of the average number of guesses) in dependence on key rate $R_K$, distortion level $\Delta$ and reliability $E$.Comment: 14 pages, 3 figures, Submitted to IEEE Transactions on Information Theor

Lycos Europe CJSC,

Abstract: The following paper offers an overview on the advancement of features of the e-learning tool “Dileco”. The main features of this tool aim to support operations, using unstable and limited Internet connection, utilizing novel solutions outlined in this paper. This system would be one of the best tools applicable for e-learning in countries with poor Internet. The paper pursues the objectives of showing some of the innovative features of the system and demonstrates the progress of the system starting from 2002. This paper aims to express technological aspects on building this system. The paper offers a snapshot of application areas of the system. The paper offers a snapshot of application areas of the system. It also addresses the research activities on virtual organizations, currently carrying out at the University of Amsterdam, which could provide impact on usage of the tool. The paper provides suggestions for future expansion of application areas covering Europe, the USA

A survey of new results in coding with feedback and searching with lies

Deppe C. A survey of new results in coding with feedback and searching with lies. In: Kranakis E, Haroutunian EA, Shahbazian E, eds. Aspects of network and information security. NATO Science for Peace and Security Series - D: Information and Communication Security. Vol 17. IOS Press: Amsterdam; 2008: 299-307.This paper is a continuation of [17]. It gives an overview of new results in the area of searching with errors and the related field of error-correcting coding from 2000 to 2005