Credential Revocation List

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We review existing revocation techniques for various anonymous credentials (not necessarily ABC). Traditional approaches include certificate revocation list (CRL) and the online certificate status protocol (OCSP). They require the credential to have a unique identifier which is visible to the server. The verifier checks whether the credential identifier is within the list or engages the certification authority using the OCSP protocol. Pseudonym-based systems [26, 9, 24, 23, 30] supports revocation efficiently, at the expense of users’ transactions being linkable.
In a verifier-local approach [25, 33], the revocation list is a collection of revoked credential identifiers. For each transaction, the verifier checks whether the presentation matches with any of the identifiers on the list. The checks are designed in a way that if the presentation token comes from a credential that is not revoked, nothing will be revealed. …show more content…
A cryptographic primitive called accumulator [15, 28, 38] is useful in this setting. An accumulator “combines” a set of values into a constat-sized element. For each value accumulated, there exists a witness to testify the fact that the value has been accumulated. Accumulators can be used to support revocation as follows: a user proves, in zero-knowledge, that his credential has been (resp. has not been) accumulated in the accumulator representing the “whitelist” (resp. blacklist). We have designed an accumulator in [5] to support revocation of credentials of the
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