A Formal Model of Identy Mixer

Identity Mixer is an anonymous credential system developed at IBM that allows users for instance to prove that they are over 18 years old without revealing their name and birthdate. This privacy-friendly technology is realized using zero-knowledge proofs. We describe a formal model of Identity Mixer that is well-suited for automated protocol verification tools in the spirit of black-box cryptography models. We also describe the translation from the credential requirement specification language CARL to an Identity Mixer proof specification.

By: Sebastian Moedersheim and Dieter Sommer

Published in: RZ3749 in 2009


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