Access with Fast Batch Verifiable Anonymous Credentials

摘要

An anonymous credential-based access control system allows the user to prove possession of credentials to a resource guard that enforce access policies on one or more resources, whereby interactions involving the same user are unlinkable by the resource guard. This paper proposes three fast batch verifiable anonymous credential schemes. With all three schemes, the user can arbitrarily choose a portion of his access rights to prove possession of credentials while the number of expensive cryptographic computations spent is independent of the number of accessx rights being chosen. Moreover, the third anonymous credential scheme is not only fast batch verifiable but also fast fine-grained revocable, which means that to verify whether an arbitrarily chosen subset of credentials is revoked entails constant computation cost.