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
-
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},
url = {https://eprint.iacr.org/2018/340}
}
