International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Eduard Hauck

Publications

Year
Venue
Title
2019
EUROCRYPT
A Modular Treatment of Blind Signatures from Identification Schemes 📺
Eduard Hauck Eike Kiltz Julian Loss
We propose a modular security treatment of blind signatures derived from linear identification schemes in the random oracle model. To this end, we present a general framework that captures several well known schemes from the literature and allows to prove their security. Our modular security reduction introduces a new security notion for identification schemes called One-More-Man In the Middle Security which we show equivalent to the classical One-More-Unforgeability notion for blind signatures.We also propose a generalized version of the Forking Lemma due to Bellare and Neven (CCS 2006) and show how it can be used to greatly improve the understandability of the classical security proofs for blind signatures schemes by Pointcheval and Stern (Journal of Cryptology 2000).

Coauthors

Eike Kiltz (1)
Julian Loss (1)