Reference : Quantifying information flow in interactive systems
Scientific congresses, symposiums and conference proceedings : Paper published in a book
Engineering, computing & technology : Computer science
Quantifying information flow in interactive systems
Mestel, David mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
In press
2019 IEEE 32nd Computer Security Foundations Symposium (CSF)
32nd IEEE Symposium on Computer Security Foundations (CSF 2019)
from 25-6-2019 to 28-6-2019
Institute of Electrical and Electronics Engineers
[en] We consider the problem of quantifying information flow in interactive systems, modelled as finite-state transducers in the style of Goguen and Meseguer. Our main result is that if the system is deterministic then the information flow is either logarithmic or linear, and there is a polynomial-time algorithm to distinguish the two cases and compute the rate of logarithmic flow. To achieve this we first extend the theory of information leakage through channels to the case of interactive systems, and establish a number of results which greatly simplify computation. We then show that for deterministic systems the information flow corresponds to the growth rate of antichains inside a certain regular language, a property called the width of the language. In a companion work we have shown that there is a dichotomy between polynomial and exponential antichain growth, and a polynomial time algorithm to distinguish the two cases and to compute the order of polynomial growth. We observe that these two cases correspond to logarithmic and linear information flow respectively. Finally, we formulate several attractive open problems, covering the cases of probabilistic systems, systems with more than two users and nondeterministic systems where the nondeterminism is assumed to be innocent rather than demonic.
Fonds National de la Recherche - FnR
FnR ; FNR11689058 > Peter Y. A. Ryan > Q-CoDe > Quantum Communication with Deniability > 01/07/2018 > 30/06/2021 > 2017

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