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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Hierarchical Group Signatures
verfasst von : Mårten Trolin, Douglas Wikström
Erschienen in: Automata, Languages and Programming
Verlag: Springer Berlin Heidelberg
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We introduce the notion of
hierarchical group signatures
. This is a proper generalization of group signatures, which allows multiple group managers organized in a tree with the signers as leaves. When opening a signature a group manager only learns to which of its subtrees, if any, the signer belongs.
We provide definitions for the new notion and construct a scheme that is provably secure given the existence of a family of trapdoor permutations. We also present a construction which is relatively practical, and prove its security in the random oracle model under the strong RSA assumption and the DDH assumption.