An Accumulator Based on Bilinear Maps and Efficient Revocation for Anonymous Credentials

Abstract. The success of electronic authentication systems, be it eID card systems or Internet authentication systems such as CardSpace, highly depends on the provided level of user-privacy. Thereby, an important requirement is an efficient means for revocation of the authentication credentials. In this paper we consider the problem of revocation for certificate-based privacy-protecting authentication systems. To date, the most efficient solutions for revocation for such systems are based on cryptographic accumulators. Here, an accumulate of all currently valid certificates is published regularly and each user holds a witness enabling her to prove the validity of her (anonymous) credential while retaining anonymity. Unfortunately, the users' witnesses must be updated at least each time a credential is revoked. For the know solutions, these updates are computationally very expensive for users and/or certificate issuers which is very problematic as revocation is a frequent event as ...

• Type: Conference
• Year: 2009
• Where: PKC
• Authors: Jan Camenisch, Markulf Kohlweiss, Claudio Soriente
• Keywords: Authentication Systems, Cryptography, Electronic Authentication Systems, Internet Authentication Systems, PKC 2009