Abstract:
Abstract. This report continues a discussion begun in the LCIS-98-17B report. As for the Ateniese-Tsudik schemes, we show that both the ID-based and self-certified public keys based group signature schemes proposed by Tseng and Jan (1998/1999) are not coalition-resistant: two colluding group members can produce untraceable group signatures. Indexing terms: Digital signatures, Group signatures
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