Yassine Lakhnech n'a pas pu assister a la soutenanceDeducibility constraints have been introduced to verify cryptographic protocols. This thesis gives a decision procedure for the satisfiability problem of general deducibility constraints. Two cases are considered: the standard Dolev-Yao theory and its extension with an associative, commutative idempotent operator. The result is applied to solve the automated distributed orchestration problem for secured Web services. As a second application we give a procedure to decide the security of a cryptographic protocol in presence of several non-communicating intruders. We also show how it is possible to detect some XML rewriting attacks on Web services.Les contraintes de déductibilité ont été intr...