---
_id: '3265'
abstract:
- lang: eng
  text: "We present CLARC (Cryptographic Library for Anonymous Reputation and Credentials),
    an anonymous credentials system (ACS) combined with an anonymous reputation system.\r\n\r\nUsing
    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.\r\n\r\nFurthermore,
    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.\r\n\r\nTo evaluate feasibility
    of our construction, we present an open-source prototype implementation."
author:
- first_name: Kai
  full_name: Bemmann, Kai
  last_name: Bemmann
- first_name: Johannes
  full_name: Blömer, Johannes
  id: '23'
  last_name: Blömer
- first_name: Jan
  full_name: Bobolz, Jan
  id: '27207'
  last_name: Bobolz
- first_name: Henrik
  full_name: Bröcher, Henrik
  id: '41047'
  last_name: Bröcher
- first_name: Denis Pascal
  full_name: Diemert, Denis Pascal
  id: '44071'
  last_name: Diemert
- first_name: Fabian
  full_name: Eidens, Fabian
  id: '25078'
  last_name: Eidens
- first_name: Lukas
  full_name: Eilers, Lukas
  last_name: Eilers
- first_name: Jan Frederik
  full_name: Haltermann, Jan Frederik
  id: '44413'
  last_name: Haltermann
- first_name: Jakob
  full_name: Juhnke, Jakob
  id: '48090'
  last_name: Juhnke
- first_name: Burhan
  full_name: Otour, Burhan
  last_name: Otour
- first_name: Laurens Alexander
  full_name: Porzenheim, Laurens Alexander
  id: '47434'
  last_name: Porzenheim
- first_name: Simon
  full_name: Pukrop, Simon
  last_name: Pukrop
- first_name: Erik
  full_name: Schilling, Erik
  last_name: Schilling
- first_name: Michael
  full_name: Schlichtig, Michael
  id: '32312'
  last_name: Schlichtig
- first_name: Marcel
  full_name: Stienemeier, Marcel
  last_name: Stienemeier
citation:
  ama: 'Bemmann K, Blömer J, Bobolz J, et al. Fully-Featured Anonymous Credentials
    with Reputation System. In: <i>Proceedings of the 13th International Conference
    on Availability, Reliability and Security - ARES ’18</i>. New York, NY, USA: ACM.
    doi:<a href="https://doi.org/10.1145/3230833.3234517">10.1145/3230833.3234517</a>'
  apa: 'Bemmann, K., Blömer, J., Bobolz, J., Bröcher, H., Diemert, D. P., Eidens,
    F., … Stienemeier, M. (n.d.). Fully-Featured Anonymous Credentials with Reputation
    System. In <i>Proceedings of the 13th International Conference on Availability,
    Reliability and Security - ARES ’18</i>. New York, NY, USA: ACM. <a href="https://doi.org/10.1145/3230833.3234517">https://doi.org/10.1145/3230833.3234517</a>'
  bibtex: '@inproceedings{Bemmann_Blömer_Bobolz_Bröcher_Diemert_Eidens_Eilers_Haltermann_Juhnke_Otour_et
    al., place={New York, NY, USA}, title={Fully-Featured Anonymous Credentials with
    Reputation System}, DOI={<a href="https://doi.org/10.1145/3230833.3234517">10.1145/3230833.3234517</a>},
    booktitle={Proceedings of the 13th International Conference on Availability, Reliability
    and Security - ARES ’18}, publisher={ACM}, 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 et al.} }'
  chicago: 'Bemmann, Kai, Johannes Blömer, Jan Bobolz, Henrik Bröcher, Denis Pascal
    Diemert, Fabian Eidens, Lukas Eilers, et al. “Fully-Featured Anonymous Credentials
    with Reputation System.” In <i>Proceedings of the 13th International Conference
    on Availability, Reliability and Security - ARES ’18</i>. New York, NY, USA: ACM,
    n.d. <a href="https://doi.org/10.1145/3230833.3234517">https://doi.org/10.1145/3230833.3234517</a>.'
  ieee: K. Bemmann <i>et al.</i>, “Fully-Featured Anonymous Credentials with Reputation
    System,” in <i>Proceedings of the 13th International Conference on Availability,
    Reliability and Security - ARES ’18</i>, Hamburg, Germany.
  mla: Bemmann, Kai, et al. “Fully-Featured Anonymous Credentials with Reputation
    System.” <i>Proceedings of the 13th International Conference on Availability,
    Reliability and Security - ARES ’18</i>, ACM, doi:<a href="https://doi.org/10.1145/3230833.3234517">10.1145/3230833.3234517</a>.
  short: 'K. Bemmann, J. Blömer, J. Bobolz, H. Bröcher, D.P. Diemert, F. Eidens, L.
    Eilers, J.F. Haltermann, J. Juhnke, B. Otour, L.A. Porzenheim, S. Pukrop, E. Schilling,
    M. Schlichtig, M. Stienemeier, in: Proceedings of the 13th International Conference
    on Availability, Reliability and Security - ARES ’18, ACM, New York, NY, USA,
    n.d.'
conference:
  end_date: 2018-08-30
  location: Hamburg, Germany
  name: ARES 2018 - SECPID
  start_date: 2018-08-27
date_created: 2018-06-14T11:19:29Z
date_updated: 2022-01-06T06:59:07Z
ddc:
- '000'
department:
- _id: '64'
doi: 10.1145/3230833.3234517
file:
- access_level: closed
  content_type: application/pdf
  creator: feidens
  date_created: 2018-11-08T10:17:39Z
  date_updated: 2018-11-08T10:17:39Z
  file_id: '5428'
  file_name: react_acs.pdf
  file_size: 920843
  relation: main_file
file_date_updated: 2018-11-08T10:17:39Z
has_accepted_license: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://eprint.iacr.org/2018/835
oa: '1'
place: New York, NY, USA
project:
- _id: '1'
  name: SFB 901
- _id: '4'
  name: SFB 901 - Project Area C
- _id: '13'
  name: SFB 901 - Subproject C1
- _id: '44'
  name: KogniHome - die mitdenkende Wohnung
publication: Proceedings of the 13th International Conference on Availability, Reliability
  and Security - ARES '18
publication_identifier:
  isbn:
  - 978-1-4503-6448-5
publication_status: accepted
publisher: ACM
quality_controlled: '1'
related_material:
  link:
  - relation: software
    url: https://github.com/upbcuk
status: public
title: Fully-Featured Anonymous Credentials with Reputation System
type: conference
user_id: '25078'
year: '2018'
...
---
_id: '2965'
author:
- first_name: Johannes
  full_name: Blömer, Johannes
  id: '23'
  last_name: Blömer
- first_name: Nils
  full_name: Löken, Nils
  id: '13703'
  last_name: Löken
citation:
  ama: 'Blömer J, Löken N. Cloud Architectures for Searchable Encryption. In: <i>Proceedings
    of the 13th International Conference on Availability, Reliability and Security,
    ARES 2018</i>. New York, NY, USA: ACM; :25:1--25:10. doi:<a href="https://doi.org/10.1145/3230833.3230853">10.1145/3230833.3230853</a>'
  apa: 'Blömer, J., &#38; Löken, N. (n.d.). Cloud Architectures for Searchable Encryption.
    In <i>Proceedings of the 13th International Conference on Availability, Reliability
    and Security, ARES 2018</i> (pp. 25:1--25:10). New York, NY, USA: ACM. <a href="https://doi.org/10.1145/3230833.3230853">https://doi.org/10.1145/3230833.3230853</a>'
  bibtex: '@inproceedings{Blömer_Löken, place={New York, NY, USA}, title={Cloud Architectures
    for Searchable Encryption}, DOI={<a href="https://doi.org/10.1145/3230833.3230853">10.1145/3230833.3230853</a>},
    booktitle={Proceedings of the 13th International Conference on Availability, Reliability
    and Security, ARES 2018}, publisher={ACM}, author={Blömer, Johannes and Löken,
    Nils}, pages={25:1--25:10} }'
  chicago: 'Blömer, Johannes, and Nils Löken. “Cloud Architectures for Searchable
    Encryption.” In <i>Proceedings of the 13th International Conference on Availability,
    Reliability and Security, ARES 2018</i>, 25:1--25:10. New York, NY, USA: ACM,
    n.d. <a href="https://doi.org/10.1145/3230833.3230853">https://doi.org/10.1145/3230833.3230853</a>.'
  ieee: J. Blömer and N. Löken, “Cloud Architectures for Searchable Encryption,” in
    <i>Proceedings of the 13th International Conference on Availability, Reliability
    and Security, ARES 2018</i>, Hamburg, Germany, pp. 25:1--25:10.
  mla: Blömer, Johannes, and Nils Löken. “Cloud Architectures for Searchable Encryption.”
    <i>Proceedings of the 13th International Conference on Availability, Reliability
    and Security, ARES 2018</i>, ACM, pp. 25:1--25:10, doi:<a href="https://doi.org/10.1145/3230833.3230853">10.1145/3230833.3230853</a>.
  short: 'J. Blömer, N. Löken, in: Proceedings of the 13th International Conference
    on Availability, Reliability and Security, ARES 2018, ACM, New York, NY, USA,
    n.d., pp. 25:1--25:10.'
conference:
  location: Hamburg, Germany
  name: ARES 2018
date_created: 2018-06-04T11:33:15Z
date_updated: 2022-01-06T06:58:49Z
ddc:
- '000'
department:
- _id: '64'
- _id: '568'
doi: 10.1145/3230833.3230853
file:
- access_level: closed
  content_type: application/pdf
  creator: ups
  date_created: 2018-11-02T14:39:46Z
  date_updated: 2018-11-02T14:39:46Z
  file_id: '5278'
  file_name: a25-Blomer.pdf
  file_size: 769807
  relation: main_file
  success: 1
file_date_updated: 2018-11-02T14:39:46Z
has_accepted_license: '1'
language:
- iso: eng
page: 25:1--25:10
place: New York, NY, USA
project:
- _id: '1'
  name: SFB 901
- _id: '4'
  name: SFB 901 - Project Area C
- _id: '13'
  name: SFB 901 - Subproject C1
publication: Proceedings of the 13th International Conference on Availability, Reliability
  and Security, ARES 2018
publication_identifier:
  isbn:
  - 978-1-4503-6448-5
publication_status: accepted
publisher: ACM
quality_controlled: '1'
status: public
title: Cloud Architectures for Searchable Encryption
type: conference
user_id: '13703'
year: '2018'
...