Welcome to the resource topic for 2022/011
Title:
Security Analysis of Coconut, an Attribute-Based Credential Scheme with Threshold Issuance
Authors: Alfredo Rial, Ania M. Piotrowska
Abstract:Coconut [NDSS 2019] is an attribute-based credential scheme with threshold issuance. We analyze its security properties. To this end, we define an ideal functionality for attribute-based access control with threshold issuance. We describe a construction that realizes our functionality. Our construction follows Coconut with a few changes. In particular, it modifies the protocols for blind issuance of credentials and for credential show so that user privacy holds against computationally unbounded adversaries. The modified protocols are slightly more efficient than those of Coconut. Our construction also extends the public key, which seems necessary to prove unforgeability.
ePrint: https://eprint.iacr.org/2022/011
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