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Proofs of Functionality for Mobile Distributed Systems

Acronym: PROFUNDIS
Start: 1/1/2002
End: 4/30/2005
Homepage: http://www.it.uu.se/profundis/

Project Status History
unknown 1/1/2002
 
 Funding Programmes
CORDIS Cost-sharing contracts1269000 

Abstract
PROFUNDIS aims at developing methods to analyse the behaviour of distributed mobile systems, in order to ascertain that they function correctly. This involves modelling the systems in an abstract way and formulating rigorous correctness properties; it will be necessary to consider open and extensible systems with unknowable parts. For this purpose we shall develop operational models (based on automata), algebras, logical languages, and associated type systems. Analysis will be conducted through computer tools, both fully automatic and interactive. The novelty of the project lies in integrating several theoretical strands into one framework and one set of tools geared towards mobile distributed systems. In particular we shall consider security properties and systems used in electronic commerce. PROFUNDIS aims at developing methods to analyse the behaviour of distributed mobile systems, in order to ascertain that they function correctly. This involves modelling the systems in an abstract way and formulating rigorous correctness properties; it will be necessary to consider open and extensible systems with unknowable parts. For this purpose we shall develop operational models (based on automata), algebras, logical languages, and associated type systems. Analysis will be conducted through computer tools, both fully automatic and interactive. The novelty of the project lies in integrating several theoretical strands into one framework and one set of tools geared towards mobile distributed systems. In particular we shall consider security properties and systems used in electronic commerce. OBJECTIVES The objective of PROFUNDIS is to advance the state of the art of formal modelling and verification techniques to the point where key issues in mobile distributed systems, such as security protocols, authentication, access rights and resource management can be treated rigorously and with considerable automatic support. In particular we shall verify properties typical in so called open systems, where the behaviour of some parts (like intruders or adversaries) is unknowable, in extensible systems, where parts may be added or removed as the system executes, and in mobile systems where physical and logical connectivity between parts may change. We shall implement automatic and partly automatic analysis methods for ascertaining correct behaviour of such systems. For this purpose we shall integrate and focus several strands of ongoing theoretical work. DESCRIPTION OF WORK The work builds on recent advances in key theories for process behaviours, logics and types. We shall develop automata theoretic models suitable for our applications, with a particular interest in how they can be represented efficiently and used by automatic tools, and we shall determine how they are best used in connection with advanced forms of modal logics. The logics themselves will be developed, both in terms of their expressiveness for properties related to space and structure, and in terms of their accessibility and ease of use through suitable high-level representations. We shall identify and develop analysis techniques related to these models and logics. This involves traditional behavioural equivalences and pre-order checking, systematic simulation, and verification in interactive proof assistants. Here type systems will play an important role. Recent results show that types may themselves be used as crude but tractable correctness properties and therefore type inference is highly relevant, moreover, we shall explore how advanced type information can assist the other analysis techniques. The ideas will to a large extent be implemented in a common tool set. Key issues here will be development and adaption of algorithms for analysis, and determining the best way of using them for practical examples. We shall in particular consider examples on security properties in systems for electronic commerce.

 
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