International Association for Cryptologic Research

Ph.D. Database

The aim of the IACR Ph.D. database is twofold. On the first hand, we want to offer an overview of Ph.D. already completed in the domain of cryptology. Where possible, this should also include a subject classification, an abstract, and access to the full text. On the second hand, it deals with Ph.D. subjects currently under investigation. This way, we provide a timely map of contemporary research in cryptology. All entries or changes need to be approved by an editor. You can contact them via phds (at)


Sébastien Canard (#280)
Name Sébastien Canard
Personal Homepage
Topic of his/her doctorate. Group signatures, variants and applications
Category cryptographic protocols
Keywords anonymity, election schemes, electronic commerce and payment, group signatures, smart cards
Ph.D. Supervisor(s) Marc Girault
Year of completion 2003
Abstract For many centuries, cryptography, or science of secret, has studied the concepts of confidentiality, integrity and authentication. More recently, it has also searched for the means of making possible for an entity to keep secret its identity. Thus, the anonymity property of a cryptographic protocol ensures a receiver that the transmitter of a document has certain rights without knowing his identity. Nevertheless, the entity has to remain responsible for what is written in the document. The group signatures are a well-known sort of cryptographic tool that provides anonymity. In this thesis, we first present a state of the art on group signature schemes and on the revocation of a member. Then we give our own proposals based on the tamper-resistance property of a smart card, which is used to produce the signature. After that, we study the applications of group signature schemes by introducing a new efficient electronic voting scheme, a fast anonymous electronic bidding scheme and a new secure fair off-line electronic cash system.
E-Mail Address sebastien.canard (at)
Last Change 2011-03-08 05:49:19
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