Updatable Privacy-Preserving Blueprints

ePrint Report: Updatable Privacy-Preserving Blueprints

Bernardo David, Felix Engelmann, Tore Frederiksen, Markulf Kohlweiss, Elena Pagnin, Mikhail Volkhov

Privacy-preserving blueprints enable users to create escrows using the auditor's public key. An escrow encrypts the evaluation of a function $P(t,x)$, where $t$ is a secret input used to generate the auditor's key and $x$ is the user's private input to escrow generation. Nothing but $P(t,x)$ is revealed even to a fully corrupted auditor. The original definition and construction (Kohlweiss et al., EUROCRYPT'23) …

auditor enable eprint report escrow evaluation function input key privacy private public public key report secret