--- res: bibo_abstract: - At Crypto 2015 Fuchsbauer, Hanser and Slamanig (FHS) presented the first standard-model construction of efficient roundoptimal blind signatures that does not require complexity leveraging. It is conceptually simple and builds on the primitive of structure-preserving signatures on equivalence classes (SPS-EQ). FHS prove the unforgeability of their scheme assuming EUF-CMA security of the SPS-EQ scheme and hardness of a version of the DH inversion problem. Blindness under adversarially chosen keys is proven under an interactive variant of the DDH assumption. We propose a variant of their scheme whose blindness can be proven under a non-interactive assumption, namely a variant of the bilinear DDH assumption. We moreover prove its unforgeability assuming only unforgeability of the underlying SPS-EQ but no additional assumptions as needed for the FHS scheme.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Georg foaf_name: Fuchsbauer, Georg foaf_surname: Fuchsbauer foaf_workInfoHomepage: http://www.librecat.org/personId=46B4C3EE-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Christian foaf_name: Hanser, Christian foaf_surname: Hanser - foaf_Person: foaf_givenName: Chethan foaf_name: Kamath Hosdurg, Chethan foaf_surname: Kamath Hosdurg foaf_workInfoHomepage: http://www.librecat.org/personId=4BD3F30E-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Daniel foaf_name: Slamanig, Daniel foaf_surname: Slamanig bibo_doi: 10.1007/978-3-319-44618-9_21 bibo_volume: 9841 dct_date: 2016^xs_gYear dct_language: eng dct_publisher: Springer@ dct_title: Practical round-optimal blind signatures in the standard model from weaker assumptions@ ...