@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}},
}