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Retrenching the Purse: Hashing Injective CLEAR Codes, and Security Properties

Banach, Richard, Jeske, Czeslaw, Poppleton, Michael and Stepney, Susan, (2006) Retrenching the Purse: Hashing Injective CLEAR Codes, and Security Properties Margaria, Tiziana, Philippou, Anna and Steffen, Bernhard (eds.) At IEEE ISOLA 2006: 2nd Int. Symp. on Leveraging Applications of Formal Methods, Verification and Validation, Cyprus. , pp. 76-89.

Record type: Conference or Workshop Item (Paper)

Abstract

The Mondex Electronic Purse is an outstanding example of industrial scale formal refinement, and was the first verification to achieve ITSEC level E6 certification. A formal abstract model and a formal concrete model were developed, and a formal refinement was hand-proved between them. Nevertheless, certain requirements issues were set beyond the scope of the formal development, or handled in an unnatural manner. The retrenchment Tower Pattern is used to address one such issue in detail: the use of a hash function rather than a total injective function when clearing the highly constrained purse logs. A retrenchment is constructed from the lowest level model to a model using a hash, and is then lifted to create two refinement developments, working at different levels of detail, and connected via retrenchments. The tower development is appropriately validated, vindicating the design used.

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More information

Published date: 2006
Additional Information: Event Dates: November 19, 2006
Venue - Dates: IEEE ISOLA 2006: 2nd Int. Symp. on Leveraging Applications of Formal Methods, Verification and Validation, Cyprus, 2006-11-19
Keywords: retrenchment, refinement, mondex, electronic purse
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 263247
URI: http://eprints.soton.ac.uk/id/eprint/263247
PURE UUID: d2687fd0-dd1e-4f97-aa03-5854038679ed

Catalogue record

Date deposited: 13 Dec 2006
Last modified: 18 Jul 2017 07:48

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Contributors

Author: Richard Banach
Author: Czeslaw Jeske
Author: Michael Poppleton
Author: Susan Stepney
Editor: Tiziana Margaria
Editor: Anna Philippou
Editor: Bernhard Steffen

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