... clear to read and feasible toconstruct for system designers who are not experts in formal methods. Keywords: services, security, specification language, formal analysis.1 Introduction Formal Security ... memberships.AVANTSSAR and Its Specification Language. The EU-funded ProjectAVANTSSAR has been concerned with developing a formal specification lan-guage and automated verification methods and tools to handle ... theoretically in terms of complexity and decidabil-ity [ 21,1 2,15], and in terms of methods and tools that are practically feasibleautomated verification [8 ,1,1 3,16].Limitations of Security Protocol...