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Feasibility of Incremental Contract Signing

Author(s): Michael Stini, Daniel Baselt, Martin Mauve.
Title: Feasibility of Incremental Contract Signing
Published: Technical Report TR-2009-001, Computer Science Department, Heinrich Heine University, Düsseldorf, Germany, September 2009
Keyword(s): Incremantal Contract Signing, Fair Offline Trading
Abstract: In this paper we evaluate the feasibility of incremental contract signing (ics)on widespread employed mobile devices. Prerequisites for the employment, such as the ability to communicate and to run cryptographic operations, will be motivated and their computational as well as timely complexity will be discussed. We will identify suitable cryptographic algorithms and recommend appropriate key lengths for mobile usage and analyze their performance on real devices. Metrics to rate the scalability will be introduced and applied. The overhead resulting from the communication necessary to conduct ics will also be evaluated by the use of different communication patterns. The trade-off between computational and timely savings will be addressed,as the efforts can differ due to different schedules.Taking care of both is crucial for the success of contract signing, because in a mobile environment battery power and time are limited resources. Possible scenarios are sketched based on these measurements and the feasibility of ics with respect to these two, above mentioned, factors will be shown. Furthermore, optimizations are presented in form of advanced signing schemes, allowing for an almost 50% gain in efficiency compared to naive schemata.
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