Anonymous credential is a major anonymous authentication scheme for enabling its holder(user) to convince a verifying entity (Service provider) of a certain attribute or property without disclosing identifying information to it.
You have to make anonymous credentials using IDEMIX technique.
There are three protocols that have to be designed
Anonymous Credential Issuance
Anonymous Credential Showing
Anonymous Credential Verification
Technique used in these protocols is IDEMIX. It's libraries and classes are available on some following llinks
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At issuer side DYNAMIC ACCUMULATOR has to be used to handle revocation of credentials.
Results will be verified on the basis of time taken by these protocols with respect to number of attributes of users.