--- res: bibo_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. @eng bibo_authorlist: - foaf_Person: foaf_givenName: Johannes foaf_name: Blömer, Johannes foaf_surname: Blömer foaf_workInfoHomepage: http://www.librecat.org/personId=23 - foaf_Person: foaf_givenName: Jan foaf_name: Bobolz, Jan foaf_surname: Bobolz foaf_workInfoHomepage: http://www.librecat.org/personId=27207 bibo_doi: 10.1007/978-3-319-93387-0_12 dct_date: 2018^xs_gYear dct_language: eng dct_title: Delegatable Attribute-based Anonymous Credentials from Dynamically Malleable Signatures@ ...