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Distributed Virtual Private Networks (dVPNs) are new VPN solutions aiming tosolve the trust-privacy concern of a VPN's central authority by leveraging adistributed architecture. In this paper, we first review the existing dVPNecosystem and debate on its privacy requirements. Then, we present VPN0, a dVPNwith strong privacy guarantees and minimal performance impact on its users.VPN0 guarantees that a dVPN node only carries traffic it has "whitelisted",without revealing its whitelist or knowing the traffic it tunnels. This isachieved via three main innovations. First, an attestation mechanism whichleverages TLS to certify a user visit to a specific domain. Second, a zeroknowledge proof to certify that some incoming traffic is authorized, e.g.,falls in a node's whitelist, without disclosing the target domain. Third, adynamic chain of VPN tunnels to both increase privacy and guarantee servicecontinuation while traffic certification is in place. The paper demonstratesVPN0 functioning when integrated with several production systems, namelyBitTorrent DHT and ProtonVPN.

VPN0: A Privacy-Preserving Decentralized Virtual Private Network