Foundations of Dynamic Group Signatures: The Case of Malicious Openers and Issuers

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Dynamic group signatures are commonly formalized in the model of Bellare, Shi, and Zhang (BSZ, CT-RSA 2005), whose security notions are defined relative to specific trust assumptions and registration state. We revisit these assumptions and systematically study which guarantees continue to hold when the trust assumptions on the issuer and opener are considered independently and no trusted registration structure is shared between them. In particular, we show that the meaning of traceabili