Paper Info
Title
A cryptographic model for branching time security properties: the case of contract signing protocols
Abstract
Some cryptographic tasks, such as contract signing and other related tasks, need to ensure complex, branching time security properties. When defining such properties one needs to deal with subtle problems regarding the scheduling of non-deterministic decisions, the delivery of messages sent on resilient (non-adversarially controlled) channels, fair executions (executions where no party, both honest and dishonest, is unreasonably precluded to perform its actions), and defining strategies of adversaries against all possible non-deterministic choices of parties and arbitrary delivery of messages via resilient channels. These problems are typically not addressed in cryptographic models and these models therefore do not suffice to formalize branching time properties, such as those required of contract signing protocols. In this paper, we develop a cryptographic model that deals with all of the above problems. One central feature of our model is a general definition of fair scheduling which not only formalizes fair scheduling of resilient channels but also fair scheduling of actions of honest and dishonest principals. Based on this model and the notion of fair scheduling, we provide a definition of a prominent branching time property of contract signing protocols, namely balance, and give the first cryptographic proof that the Asokan-Shoup-Waidner two-party contract signing protocol is balanced.
Year
DOI
Venue
2007
10.1007/978-3-540-74835-9_28
Lecture Notes in Computer Science
Keywords
DocType
Volume
cryptographic model,time property,contract signing protocol,fair execution,resilient channel,fair scheduling,time security property,contract signing,asokan-shoup-waidner two-party contract signing,cryptographic proof,cryptographic task,graphical model
Conference
2007
ISSN
ISBN
Citations 
0302-9743
3-540-74834-2
6
PageRank 
References 
Authors
0.46
21
3
Name
Order
Citations
PageRank
Véronique Cortier1113556.32
Ralf Küsters2101469.62
Bogdan Warinschi3151468.98