Types for Security Protocols*

We revise existing type-based analyses of security protocols bydevising a core type system for secrecy, integrity and authentication inthe setting of spi-calculus processes. These fundamental security proper-ties are usually studied independently. Our exercise of considering all ofthem in a uniform framework is interesting under different perspectives:(i) it provides a general overview of how type theory can be applied toreason on security protocols; (ii) it illustrates and compares the mainresults and techniques in literature; (iii) perhaps more importantly, itshows that by combining techniques deployed for different properties,existing type-systems can be significantly simplified.