Many cryptographic tasks and protocols, such as non-repudiation, contract-signing, voting,
auction, identity-based encryption, and certain forms of secure multi-party computation …

Accountability mechanisms, which rely on after-the-fact verification, are an attractive means
to enforce authorization policies. In this paper, we describe an operational model of …

The growing importance of electronic commerce and the increasing number of applications
in this area has led research into studying methods of how to perform safe and secure online …

Most model checking techniques for security protocols make a number of simplifying
assumptions on the protocol and/or on its execution environment that greatly complicate or …

We describe a protocol design process, and illustrate its use by creating ATSPECT, an
authentication test-based secure protocol for electronic commerce transactions. The design …

We analyze the multiparty contract-signing protocols of Garay and MacKenzie (GM) and of
Baum and Waidner (BW). We use a finite-state tool, M ocha, which allows specification of …

We present a framework for abstracting two-player turn-based games that preserves any
formula of the alternating/spl mu/-calculus (AMC). Unlike traditional conservative …

We present three case studies, investigating the use of probabilistic model checking to
automatically analyse properties of probabilistic contract signing protocols. We use the …

Electronic contract signing requires the design of protocols that guarantee that the exchange
is fair. In the past 5 years, we have observed that trusted third parties (TTPs) can be replaced …

Voting is a mechanism of utmost importance to social processes. In this paper, we focus on
the strategic aspect of information security in voting procedures. We argue that the notions of …