Offline-verifiable Data from Distributed Ledger-based Registries

Stefan More, Jakob Heher, Clemens Walluschek

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandBegutachtung


Trust management systems often use registries to authenticate data, or form trust decisions. Examples are revocation registries and trust status lists. By introducing distributed ledgers (DLs), it is also possible to create decentralized registries. A verifier then queries a node of the respective ledger, e.g., to retrieve trust status information during the verification of a credential. While this ensures trustworthy information, the process requires the verifier to be online and the ledger node available. Additionally, the connection from the verifier to the registry poses a privacy issue, as it leaks information about the user's behavior.
In this paper, we resolve these issues by extending existing ledger APIs to support results that are trustworthy even in an offline setting. We do this by introducing attestations of the ledger's state, issued by ledger nodes, aggregatable into a collective attestation by all nodes. This attestation enables a user to prove the provenance of DL-based data to an offline verifier. Our approach is generic. So once deployed it serves as a basis for any use case with an offline verifier. We also provide an implementation for the Ethereum stack and evaluate it, demonstrating the practicability of our approach.
TitelProceedings - 19th International Conference on Security and Cryptography (SECRYPT 2022)
PublikationsstatusVeröffentlicht - Juli 2022
Veranstaltung19th International Conference on Security and Cryptography: SECRYPT 2022 - Lisbon Marriott Hotel, Lisbon, Portugal
Dauer: 11 Juli 202213 Juli 2022
Konferenznummer: 19


Konferenz19th International Conference on Security and Cryptography
KurztitelSECRYPT 2022


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