Importance

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Abstract

A method for generating and verifying a user attestation-signature value and issuing an attestation value for using a user attestation-signature value that corresponds to at least one attribute, each with an attribute value remaining anonymous includes: providing a module public key and a security module attestation value providing a user public key that includes: at least one user determined attribute value and a proof value demonstrating that the user public key is validly derived from the module public key of the security module deriving an attester determined attribute value and an attestation value based on an attester secret key, the user public key, and an anonymous attribute value and verifying whether or not (i) the user attestation-signature value was validly derived from the security module attestation value provided by the security module and the attestation value, (and (ii) the attestation value is associated with a subset of at least one attribute, each attribute in the subset having a revealed attribute value.

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First Claim