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Credential compromise is hard to detect and hard to mitigate. To address thisproblem, we present larch, an accountable authentication framework with strongsecurity and privacy properties. Larch protects user privacy while ensuringthat the larch log server correctly records every authentication. Specifically,an attacker who compromises a user's device cannot authenticate withoutcreating evidence in the log, and the log cannot learn which web service(relying party) the user is authenticating to. To enable fast adoption, larchis backwards-compatible with relying parties that support FIDO2, TOTP, andpassword-based login. Furthermore, larch does not degrade the security andprivacy a user already expects: the log server cannot authenticate on behalf ofa user, and larch does not allow relying parties to link a user acrossaccounts. We implement larch for FIDO2, TOTP, and password-based login. Given aclient with four cores and a log server with eight cores, an authenticationwith larch takes 150ms for FIDO2, 91ms for TOTP, and 74ms for passwords(excluding preprocessing, which takes 1.23s for TOTP).

Accountable authentication with privacy protection: The Larch system for universal login