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U-Prove - Microsoft Research

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U-Prove components are released in the Security and Cryptography Incubations Quarterly Technology Drop. A U-Prove token is a type of credential similar to a PKI certificate that can encode attributes of any type, but with two important differences: 1) The issuance and presentation of a token is unlinkable due to the special type of public key and signature encoded in the token; the cryptographic “wrapping” of the attributes contain no correlation handles. This prevents unwanted tracking of users when they use their U-Prove tokens, even by colluding insiders. 2) Users can minimally disclose information about what attributes are encoded in a token in response to dynamic verifier policies. As an example, a user may choose to only disclose a subset of the encoded attributes, prove that her undisclosed name does not appear on a deny list, or prove that she is of age without disclosing her actual birthdate. These user-centric aspects make the U-Prove technology ideally suited to creating the

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