eprint.iacr.org will be offline for approximately an hour for routine maintenance at 11pm UTC on Tuesday, April 16. We lost some data between April 12 and April 14, and some authors have been notified that they need to resubmit their papers.

Paper 2018/340

Delegatable Attribute-based Anonymous Credentials from Dynamically Malleable Signatures

Johannes Blömer and Jan Bobolz

Abstract

In this paper, we introduce the notion of delegatable attribute-based anonymous credentials (DAAC). Such systems offer fine-grained anonymous access control and they give the credential holder the ability to issue more restricted credentials to other users. In our model, credentials are parameterized with attributes that (1) express what the credential holder himself has been certified and (2) define which attributes he may issue to others. Furthermore, we present a practical construction of DAAC. For this construction, we deviate from the usual approach of embedding a certificate chain in the credential. Instead, we introduce a novel approach for which we identify a new primitive we call dynamically malleable signatures (DMS) as the main ingredient. This primitive may be of independent interest. We also give a first instantiation of DMS with efficient protocols.

Metadata
Available format(s)
PDF
Publication info
Published elsewhere. Major revision. ACNS 2018
Keywords
delegatable credentialsanonymous credentialsattribute-based credentialsauthenticationmalleable signatures
Contact author(s)
jan bobolz @ upb de
History
2018-04-16: received
Short URL
https://ia.cr/2018/340
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2018/340,
      author = {Johannes Blömer and Jan Bobolz},
      title = {Delegatable Attribute-based Anonymous Credentials from Dynamically Malleable Signatures},
      howpublished = {Cryptology ePrint Archive, Paper 2018/340},
      year = {2018},
      note = {\url{https://eprint.iacr.org/2018/340}},
      url = {https://eprint.iacr.org/2018/340}
}
Note: In order to protect the privacy of readers, eprint.iacr.org does not use cookies or embedded third party content.