CARDIS '02 Abstract
Implementing Group Signature Schemes with Smart Cards
and Marc Girault, France Telecom
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, with constant size of signatures and
keys (, ,  and ).
However, some problems still remain among which the large number
of computations during the signature protocol and the difficulty
to achieve coalition-resistance and to deal with member
revocation. In this paper we investigate the use of a
tamper-resistant device (typically a smart card) to efficiently
solve those problems.
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