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Device Binding for Anonymous Credentials on Legacy Phones (Lehmann, Zacharakis 2026)¶
Summary¶
Addresses the curve incompatibility problem for adding device binding to anonymous credentials in the EUDI Wallet context: anonymous credentials require pairing-friendly curves for efficiency, but consumer phone secure elements are restricted to ECDSA on P-256. Device binding ties a credential to a hardware-protected key and requires a fresh proof-of-possession per presentation; this paper bridges the curve gap to enable that binding without requiring new hardware.