Valentín Valero Ruiz

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E-commerce is based on transactions between client and server agents. These transactions require a protocol that provides privacy and reliability between these two agents. A widely used protocol on e-commerce is Transport Layer Security (TLS). In this paper we present a way to use Formal Methods to ensure the e-commerce properties of this protocol.(More)
In this work we explain how to perform the design and verification of a Web Services composition with time restrictions using the Web Services Translation tool, WST for short. We pay special attention to Web Services systems with timing restrictions. As illustration, we use a case study called " Form Generator Service " , a system that allows developers to(More)
In this paper we show how we can use formal methods for describing and analyzing the behavior of Web Services, and more specifically those including time restrictions. Then, our starting point are Web Services descriptions written in WSCI-WSCDL (XML-based description languages). These descriptions are then translated into timed automata, and then, we use a(More)
Timed-arc Petri nets are not Turing powerful, because, in particular, they cannot simulate a counter with test on zero. Thus, we could think that this model does not extend significatively the expressiveness of untimed Petri nets. But this is not true; in this paper we show that the differences between them are big enough to make the reachability problem(More)
In this paper we present a stochastic extension of finite PBC, sPBC, in which actions have a stochastic delay associated , which is taken from a negative exponential distribution. We define for the language both an operational and a denotational semantics, using a class of labelled stochastic Petri net as supporting values. In this paper we restrict our(More)
The main goal of this paper is to extend sPBC with the iteration operator, providing an operational semantics for the language, as well as a denotational semantics, which is based on stochastic Petri nets. With this new operator we can model some repetitive behaviours, and then we obtain a formal method that can be easily used for the design of(More)
A Web Service is a self-describing, self-contained modular application that can be published , located, and invoked over a network, e.g. the Internet. Web Services composition provides a way to obtain value-added services by combining several Web Services. The composition of Web Services is, therefore, suitable to support enterprise application integration.(More)