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Title:
Modelling Time, or A Step Towards Reduction-based Security Proofs for OTP and Kerberos
Authors: Jörg Schwenk
Abstract:The notion of time plays an important role in many practically deployed cryptographic protocols, ranging from One-Time-Password (OTP) tokens to the Kerberos protocol. However, time is difficult to model in a Turing machine environment. We propose the first such model, where time is modelled as a global counter T . We argue that this model closely matches several implementations of time in computer environments. The usefulness of the model is shown by giving complexity-theoretic security proofs for OTP protocols, HMQV-like one-round AKE protocols, and a variant of the basic Kerberos building block.
ePrint: https://eprint.iacr.org/2013/604
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