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Abstract:
For group signatures with verifier-local revocation (GS- VLR ), selfless-anonymity (SA), which only ensures the anonymity of a signature against an adversary not possessing the signing secret-keys for members who were involved in the generation of the challenge signature, is strictly weaker than the de facto standard anonymity notion, full-anonymity, where the adversary is allowed to corrupt all members. At ICICS 2018, Hou et al. delivered a lattice-based fully anonymous GS- VLR scheme (as one core building block for their semi-generic construction of hierarchical GS- VLR ) based on the first lattice-based GS scheme introduced by Gordon et al. at ASIACRYPT 2010. In this paper, we demonstrate that their scheme does not consider the anonymity for revoked members (no matter the misbehaving members or the honest ones who voluntarily leave), an implicit requirement for GS- VLR in a real-life application. Subsequently, we provide a modification of their construction to fix the mentioned weakness. © 2021, Springer Nature Switzerland AG.
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ISSN: 0302-9743
Year: 2021
Volume: 13041 LNCS
Page: 369-382
Language: English
0 . 4 0 2
JCR@2005
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