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CryptoVerif claims to evaluate the probability of a successful attack against a protocol relative to the probability of breaking each cryptographic primitive, i.e. it can establish concrete security.
References
Blanchet, Bruno (2008). "A Computationally Sound Mechanized Prover for Security Protocols". IEEE Transactions on Dependable and Secure Computing. 5 (4): 193–207. doi:10.1109/TDSC.2007.1005.