Secure Keyless Multi-Party Storage Scheme
Résumé
Using threshold secret sharing, we propose a solution tai-
lored for forgetful clients (i.e., not required to keep any cryptographic
secret) while accommodating the dynamic nature of multi-cloud deploy-
ments. Furthermore, we delegate the computation and distribution of
shares to an intermediate server (proxy), effectively minimizing the client
workload. We propose two variants of a keyless, space-efficient multi-
cloud storage scheme named KAPRE and KAME. Our solution KAPRE
requires less communications and computations, while KAME preserves
data confidentiality against a colluding proxy. Our protocols offer robust
guarantees for data integrity, and we demonstrate the proxy’s ability to
identify and attribute blame to servers responsible for sending corrupted
shares during data reconstruction. We establish a comprehensive secu-
rity model and provide proofs of the security properties of our protocols.
To complement this theoretical analysis, we present a proof-of-concept
to illustrate the practical implementation of our proposed scheme.
Domaines
Cryptographie et sécurité [cs.CR]
Origine : Fichiers produits par l'(les) auteur(s)