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Title:
COCO: Coconuts and Oblivious Computations for Orthogonal Authentication
Authors: Yamya Reiki
Abstract:Authentication often bridges real-world individuals and their virtual public identities, like usernames, user IDs and e-mails, exposing vulnerabilities that threaten user privacy. This research introduces COCO (Coconuts and Oblivious Computations for Orthogonal Authentication), a framework that segregates roles among Verifiers, Authenticators, and Clients to achieve privacy-preserving authentication.
COCO eliminates the need for Authenticators to directly access virtual public identifiers or real-world identifiers for authentication. Instead, the framework leverages Oblivious Pseudorandom Functions (OPRFs) and an extended Coconut Credential Scheme to ensure privacy by introducing separate unlinkable orthogonal authentication identifiers and a full-consensus mechanism to perform zero-knowledge authentications whose proof-s are unlinkable across multiple sessions. Authentication process becomes self-contained, preventing definitive reverse tracing of virtual public identifiers to real-world identifiers.
ePrint: https://eprint.iacr.org/2024/2066
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