@inbook{45901,
  author       = {{Blömer, Johannes and Bobolz, Jan and Eidens, Fabian and Jager, Tibor and Kramer, Paul}},
  booktitle    = {{On-The-Fly Computing -- Individualized IT-services in dynamic markets}},
  editor       = {{Haake, Claus-Jochen and Meyer auf der Heide, Friedhelm and Platzner, Marco and Wachsmuth, Henning and Wehrheim, Heike}},
  pages        = {{237--246}},
  publisher    = {{Heinz Nixdorf Institut, Universität Paderborn}},
  title        = {{{Practical Cryptograhic Techniques for Secure and Privacy-Preserving Customer Loyalty Systems}}},
  doi          = {{10.5281/zenodo.8068755}},
  volume       = {{412}},
  year         = {{2023}},
}

@inbook{45891,
  author       = {{Blömer, Johannes and Eidens, Fabian and Jager, Tibor and Niehues, David and Scheideler, Christian}},
  booktitle    = {{On-The-Fly Computing -- Individualized IT-services in dynamic markets}},
  editor       = {{Haake, Claus-Jochen and Meyer auf der Heide, Friedhelm and Platzner, Marco and Wachsmuth, Henning and Wehrheim, Heike}},
  pages        = {{145--164}},
  publisher    = {{Heinz Nixdorf Institut, Universität Paderborn}},
  title        = {{{Robustness and Security}}},
  doi          = {{10.5281/zenodo.8068629}},
  volume       = {{412}},
  year         = {{2023}},
}

@phdthesis{35188,
  author       = {{Eidens, Fabian}},
  title        = {{{Privacy-Preserving Cryptography: Attribute-Based Signatures and Updatable Credentials}}},
  doi          = {{10.17619/UNIPB/1-1653}},
  year         = {{2022}},
}

@unpublished{26645,
  author       = {{Bobolz, Jan and Eidens, Fabian and Heitjohann, Raphael and Fell, Jeremy}},
  publisher    = {{IACR eprint}},
  title        = {{{Cryptimeleon: A Library for Fast Prototyping of Privacy-Preserving Cryptographic Schemes}}},
  year         = {{2021}},
}

@inproceedings{29566,
  author       = {{Bobolz, Jan and Eidens, Fabian and Krenn, Stephan and Ramacher, Sebastian and Samelin, Kai}},
  booktitle    = {{Cryptology and Network Security}},
  isbn         = {{9783030925475}},
  issn         = {{0302-9743}},
  publisher    = {{Springer International Publishing}},
  title        = {{{Issuer-Hiding Attribute-Based Credentials}}},
  doi          = {{10.1007/978-3-030-92548-2_9}},
  year         = {{2021}},
}

@inproceedings{16487,
  author       = {{Bobolz, Jan and Eidens, Fabian and Krenn, Stephan and Slamanig, Daniel and Striecks, Christoph}},
  booktitle    = {{Proceedings of the 15th ACM Asia Conference on Computer and Communications Security (ASIA CCS ’20),}},
  location     = {{Taiwan}},
  publisher    = {{ACM}},
  title        = {{{Privacy-Preserving Incentive Systems with Highly Efficient Point-Collection}}},
  doi          = {{10.1145/3320269.3384769}},
  year         = {{2020}},
}

@inproceedings{13904,
  abstract     = {{In this paper, we introduce updatable anonymous credential systems (UACS) and use them to construct a new privacy-preserving incentive system. In a UACS, a user holding a credential certifying some attributes can interact with the corresponding issuer to update his attributes. During this, the issuer knows which update function is run, but does not learn the user's previous attributes. Hence the update process preserves anonymity of the user. One example for a class of update functions are additive updates of integer attributes, where the issuer increments an unknown integer attribute value v by some known value k. This kind of update is motivated by an application of UACS to incentive systems. Users in an incentive system can anonymously accumulate points, e.g. in a shop at checkout, and spend them later, e.g. for a discount.}},
  author       = {{Blömer, Johannes and Bobolz, Jan and Diemert, Denis Pascal and Eidens, Fabian}},
  booktitle    = {{Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security - CCS '19}},
  location     = {{London}},
  title        = {{{Updatable Anonymous Credentials and Applications to Incentive Systems}}},
  doi          = {{10.1145/3319535.3354223}},
  year         = {{2019}},
}

@inproceedings{2862,
  author       = {{Blömer, Johannes and Eidens, Fabian and Juhnke, Jakob}},
  booktitle    = {{Topics in Cryptology - {CT-RSA} 2018 - The Cryptographers' Track at the {RSA} Conference 2018, Proceedings}},
  isbn         = {{9783319769523}},
  issn         = {{0302-9743}},
  location     = {{San Francisco, CA, USA}},
  pages        = {{470--490}},
  publisher    = {{Springer International Publishing}},
  title        = {{{Practical, Anonymous, and Publicly Linkable Universally-Composable Reputation Systems}}},
  doi          = {{10.1007/978-3-319-76953-0_25}},
  year         = {{2018}},
}

@inproceedings{3265,
  abstract     = {{We present CLARC (Cryptographic Library for Anonymous Reputation and Credentials), an anonymous credentials system (ACS) combined with an anonymous reputation system.

Using CLARC, users can receive attribute-based credentials from issuers. They can efficiently prove that their credentials satisfy complex (access) policies in a privacy-preserving way. This implements anonymous access control with complex policies.

Furthermore, CLARC is the first ACS that is combined with an anonymous reputation system where users can anonymously rate services. A user who gets access to a service via a credential, also anonymously receives a review token to rate the service. If a user creates more than a single rating, this can be detected by anyone, preventing users from spamming ratings to sway public opinion.

To evaluate feasibility of our construction, we present an open-source prototype implementation.}},
  author       = {{Bemmann, Kai and Blömer, Johannes and Bobolz, Jan and Bröcher, Henrik and Diemert, Denis Pascal and Eidens, Fabian and Eilers, Lukas and Haltermann, Jan Frederik and Juhnke, Jakob and Otour, Burhan and Porzenheim, Laurens Alexander and Pukrop, Simon and Schilling, Erik and Schlichtig, Michael and Stienemeier, Marcel}},
  booktitle    = {{Proceedings of the 13th International Conference on Availability, Reliability and Security - ARES '18}},
  isbn         = {{978-1-4503-6448-5}},
  location     = {{Hamburg, Germany}},
  publisher    = {{ACM}},
  title        = {{{Fully-Featured Anonymous Credentials with Reputation System}}},
  doi          = {{10.1145/3230833.3234517}},
  year         = {{2018}},
}

@inproceedings{3873,
  author       = {{Blömer, Johannes and Eidens, Fabian and Juhnke, Jakob}},
  booktitle    = {{The International Conference on Cryptology And Network Security (CANS)}},
  isbn         = {{978-3-030-00434-7}},
  location     = {{Naples, Italy}},
  pages        = {{235--255}},
  publisher    = {{Springer}},
  title        = {{{Enhanced Security of Attribute-Based Signatures}}},
  doi          = {{10.1007/978-3-030-00434-7_12}},
  volume       = {{11124}},
  year         = {{2018}},
}

@misc{321,
  author       = {{Eidens, Fabian}},
  publisher    = {{Universität Paderborn}},
  title        = {{{Anonymous credential system based on q-Strong Diffie-Hellman Assumption}}},
  year         = {{2015}},
}

@misc{638,
  author       = {{Eidens, Fabian}},
  publisher    = {{Universität Paderborn}},
  title        = {{{Adaptive Verbindungsstrategien in dynamischen Suchnetzwerken}}},
  year         = {{2012}},
}