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Information Leakage of Non-Terminating Processes

Authors Fabrizio Biondi, Axel Legay, Bo Friis Nielsen, Pasquale Malacaria, Andrzej Wasowski

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Fabrizio Biondi
Axel Legay
Bo Friis Nielsen
Pasquale Malacaria
Andrzej Wasowski

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Fabrizio Biondi, Axel Legay, Bo Friis Nielsen, Pasquale Malacaria, and Andrzej Wasowski. Information Leakage of Non-Terminating Processes. In 34th International Conference on Foundation of Software Technology and Theoretical Computer Science (FSTTCS 2014). Leibniz International Proceedings in Informatics (LIPIcs), Volume 29, pp. 517-529, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014) https://doi.org/10.4230/LIPIcs.FSTTCS.2014.517

Abstract

In recent years, quantitative security techniques have been providing effective measures of the security of a system against an attacker. Such techniques usually assume that the system produces a finite amount of observations based on a finite amount of secret bits and terminates, and the attack is based on these observations. By modeling systems with Markov chains, we are able to measure the effectiveness of attacks on non-terminating systems. Such systems do not necessarily produce a finite amount of output and are not necessarily based on a finite amount of secret bits. We provide characterizations and algorithms to define meaningful measures of security for non-terminating systems, and to compute them when possible. We also study the bounded versions of the problems, and show examples of non-terminating programs and how their effectiveness in protecting their secret can be measured.

Subject Classification

Keywords
  • Quantitative information flow
  • Markov chain
  • information leakage
  • infinite execution

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