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Codes and Cryptography
[Translate to English:] AG Codes und Kryptographie Show image information

[Translate to English:] AG Codes und Kryptographie

Henrik Bröcher

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Publications
Henrik Bröcher

Faculty for Electrical Engineering, Computer Science, and Mathematics > Department of Computer Science > Codes and Cryptography

Research Associate

VCard

Sonderforschungsbereich 901

Research Associate

VCard

Phone:
+49 5251 60-6328
E-mail:
henrik.broecher(at)upb(dot)de
Office:
O4.164
Web:
Homepage
Visitor:
Pohlweg 51
33098 Paderborn

Open list in Research Information System

2022

On the impossibility of surviving (iterated) deletion of weakly dominated strategies in rational MPC

J. Blömer, J. Bobolz, H. Bröcher, 2022

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2019

Rational Secure Multiparty Computation

H. Bröcher, Master's thesis, Universität Paderborn, 2019

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2018

Fully-Featured Anonymous Credentials with Reputation System

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, 2018

Abstract
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DOI

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.


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