Proofs_of_Retrievability_CCS

Proofs_of_Retrievability_CCS - PORs: Proofs of...

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PORs: Proofs of Retrievability for Large Files Ari Juels RSA Laboratories Burt Kaliski 2 0 7 R S A L a b o r t ie s EMC Innovation Network
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The Subprime Mortgage Debacle Banks issued dubious mortgages to customers Banks packed mortgages as securities and sold them They “outsourced” risk But risk came home to roost… E.g. Bank of America’s Q3 ’07 earnings dropped 32% The moral: Risk is passed around in complex, difficult-to-trace ways…
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Storage-as-a-Service (SaaS) M egArchive Corp. Seattle, USA Alice MiniFile Inc. Bangalore, India Bob Liverpool, UK Peer-to-peer network y W e d in g P h o to s ! One day, Alice’s machine crashes, so she contacts MegArchive…
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Other financially motivated service degradation MegArchive moves Alice’s file to a slow disk array File is there, but retrieval is unacceptably slow MegArchive uses cheap storage that degrades over time MegArchive throws away a portion of Alice’s file to save space Most users don’t retrieve their backup files anyway
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Alice would like to ensure that her file F is retrievable She may also want to ensure compliance with a Service-Level Agreement (SLA) The simple approach: Alice periodically downloads F This is resource-intensive! What about spot-checking instead?
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Proofs_of_Retrievability_CCS - PORs: Proofs of...

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