On the Difficulty of Coalition-Resistance in Group Signature Schemes (II)

Implementing Group Signature Schemes with Smart Cards

Group signature schemes allow a group member to sign messages on behalf of the group. Such signatures must be anonymous and unlinkable but, whenever needed, a designated group manager can reveal the identity of the signer. During the last decade group signatures have been playing an important role in cryptographic research; many solutions have been proposed and some of them are quite efficient,...

On the Difficulty of Coalition-Resistance in Group Signature Schemes (I)

Very recently, Ateniese and Tsudik suggested two nice and practical group signature schemes allowing members of a group to sign on behalf of the group in such a way that the signer’s identity can be recovered by the group manager in case of abuse. Their first scheme does not address hostile coalition of group members while the second one is supposed to be coalition-resistant. This report shows ...

On the Diiculty of Coalition-resistance in Group Signature Schemes

Double voter perceptible blind signature based electronic voting protocol

Mu et al. have proposed an electronic voting protocol and claimed that it protects anonymity of voters, detects double voting and authenticates eligible voters. It has been shown that it does not protect voter's privacy and prevent double voting. After that, several schemes have been presented to fulfill these properties. However, many of them suffer from the same weaknesses. In this p...

A New Digital Signature Scheme and its Application to aPractical

This paper introduces a new digital signature scheme that is provably secure against adaptive chosen message attacks provided the so-called Strong RSA Assumption holds. This signature scheme leads to a new coalition-resistant group signature scheme that is signiicantly more eecient than the previously known schemes with the same security properties .