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Researchers from Technion-Israel Institute of Technology Report New Studies and Findings in the Area of Information Theory

March 4, 2014

By a News Reporter-Staff News Editor at Information Technology Newsweekly -- Investigators publish new report on Information Theory. According to news originating from Haifa, Israel, by VerticalNews correspondents, research stated, "This paper investigates the problem of source-channel coding for secure transmission with arbitrarily correlated side informations at both receivers. This scenario consists of an encoder (referred to as Alice) that wishes to compress a source and send it through a noisy channel to a legitimate receiver (referred to as Bob)."

Our news journalists obtained a quote from the research from the Technion-Israel Institute of Technology, "In this context, Alice must simultaneously satisfy the desired requirements on the distortion level at Bob and the equivocation rate at the eavesdropper (referred to as Eve). This setting can be seen as a generalization of the problems of secure source coding with (uncoded) side information at the decoders and the wiretap channel. A general outer bound on the rate-distortion-equivocation region, as well as an inner bound based on a pure digital scheme, is derived for arbitrary channels and side informations. In some special cases of interest, it is proved that this digital scheme is optimal and that separation holds. However, it is also shown through a simple counter-example with a binary source that a pure analog scheme can outperform the digital one while being optimal. According to these observations and assuming matched bandwidth, a novel hybrid digital/analog scheme that aims to gather the advantages of both digital and analog ones is then presented. In the quadratic Gaussian setup when side information is only present at the eavesdropper, this strategy is proved to be optimal. Furthermore, it outperforms both digital and analog schemes and cannot be achieved via time-sharing."

According to the news editors, the research concluded: "Through an appropriate coding, the presence of any statistical difference among the side informations, the channel noises, and the distortion at Bob can be fully exploited in terms of secrecy."

For more information on this research see: Secure Transmission of Sources Over Noisy Channels With Side Information at the Receivers. IEEE Transactions on Information Theory, 2014;60(1):713-739. IEEE Transactions on Information Theory can be contacted at: Ieee-Inst Electrical Electronics Engineers Inc, 445 Hoes Lane, Piscataway, NJ 08855-4141, USA. (Institute of Electrical and Electronics Engineers -; IEEE Transactions on Information Theory -

The news correspondents report that additional information may be obtained from J. Villard, Technion Israel Inst Technol, Dept. of Elect Engn, IL-32000 Haifa, Israel. Additional authors for this research include P. Piantanida and S. Shamai.

Keywords for this news article include: Asia, Haifa, Israel, Information Theory

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Source: Information Technology Newsweekly

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