Cryptology ePrint Archive: Report 2008/489

HAIL: A High-Availability and Integrity Layer for Cloud Storage

Kevin D. Bowers and Ari Juels and Alina Oprea

Abstract: We introduce HAIL (High-Availability and Integrity Layer), a distributed cryptographic system that permits a set of servers to prove to a client that a stored file is intact and retrievable. HAIL strengthens, formally unifies, and streamlines distinct approaches from the cryptographic and distributed-systems communities. Proofs in HAIL are efficiently computable by servers and highly compact---typically tens or hundreds of bytes, irrespective of file size. HAIL cryptographically verifies and reactively reallocates file shares. It is robust against an active, mobile adversary, i.e., one that may progressively corrupt the full set of servers. We propose a strong, formal adversarial model for HAIL, and rigorous analysis and parameter choices. We show how HAIL improves on the security and efficiency of existing tools, like Proofs of Retrievability (PORs) deployed on individual servers. We also report on a prototype implementation.

Category / Keywords: cryptographic protocols / storage security, proofs of retrievability, erasure coding

Date: received 20 Nov 2008, last revised 20 Apr 2009

Contact author: Alina Oprea (aoprea at rsa com)

Available format(s): PDF | BibTeX Citation

Version: 20090420:191549 (All versions of this report)

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