Bitcoin is the most widely known distributed, peer-to-peer payment network without
existence of a central authority. In Bitcoin, users do not use real names; instead …

The transactions in blockchain framework, based cryptocurrencies are publicly available,
thereby accessible to all users by design. However, the anonymity of blockchain …

Mixcoin is a Bitcoin mixing protocol proposed by Bonneau et al. which provides strong
accountability guarantees [13]. However, in the Mixcoin protocol, the map** from a user's …

A modular approach for cryptographic protocols leads to a simple design but often inefficient
constructions. On the other hand, ad hoc constructions may yield efficient protocols at the …

Abstract Structure-preserving signatures (SPS) are a powerful building block for
cryptographic protocols. We introduce SPS on equivalence classes (SPS-EQ), which allow …

Abstract Structure-preserving signatures are signatures defined over bilinear groups that
rely on generic group operations. In particular, the messages and signatures consist of …

Group signatures are a central cryptographic primitive where users can anonymously and
accountably sign messages in the name of a group they belong to. Several efficient …

Abstract Structure-preserving signatures (SPS) are signature schemes where messages,
signatures and public keys all consist of elements of a group over which a bilinear map is …

Group signatures are a central cryptographic primitive, simultaneously supporting
accountability and anonymity. They allow users to anonymously sign messages on behalf of …

Abstract Structure-preserving signatures are a quite recent but important building block for
many cryptographic protocols. In this paper, we introduce a new type of structure-preserving …