Team Cassis

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Section: Application Domains

Verification of security protocols

Security protocols such as SET, TLS and Kerberos, are designed for establishing the confidence of electronic transactions. They rely on cryptographic primitives, the purpose of which is to ensure integrity of data, authentication or anonymity of participants, confidentiality of transactions, etc.

Experience has shown that the design of those protocols is often erroneous, even when assuming that cryptographic primitives are perfect, i.e., that an encoded message cannot be decrypted without the appropriate key. An intruder can intercept, analyze and modify the exchanged messages with very few computations and therefore, for example, generate important economic damage.

Analyzing cryptographic protocols is complex because the set of configurations to consider is very large, and can even be infinite : one has to consider any number of sessions, any size of messages, sessions interleaving, algebraic properties of encryption or data structures.

Our objective is to automatize as much as possible the analysis of protocols starting from their specification. This consists in designing a tool easy to use, permitting to specify a large number of protocols thanks to a standard high-level language, and permitting either to look for flaws in a given protocol or to check whether it satisfies a given property. Such a tool is essential for verifying existing protocols, but also for helping in designing new ones. For our tool to be easy to use, it has to provide a graphical interface allowing a user to do only click-button.

Our tools for verifying security protocols are available as components of the AVISPA platform. As an extension of the AVISPA specification language, we are working on a new environment called CASRUL for handling more general protocols like e-business protocols for example.


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