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RSA Laboratories

Proofs Of Retrievability

As cloud storage is increasingly being used for backup and archival services, it becomes important to ensure that cloud-based data is handled appropriately. Proofs of Retrievability (PORs) are protocols that enable users to check that data outsourced to the cloud is stored in its entirety, uncorrupted, and available on demand. PoRs are efficient both in terms of bandwidth and computation usage: with a short challenge, a user can verify that an entire archive is intact and retrievable.

Research Papers

  • Ari Juels and Burt Kaliski. PORs: Proofs of Retrievability for Large Files. In Proceedings of the 14th ACM Conference on Computer and Communications Security (CCS '07), pages 584–597, 2007.
  • Kevin D. Bowers, Ari Juels, and Alina Oprea. Proofs of retrievability: Theory and implementation. In Proceedings of the ACM Cloud Computing Security Workshop (CCSW '09), 2009. (conference version)(full version)
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