DupLESS: Server-Aided Encryption for Deduplicated Storage

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Provided by: University of Calgary
Topic: Security
Format: PDF
Cloud storage service providers such as dropbox, mozy, and others perform de-duplication to save space by only storing one copy of each file uploaded. Should clients conventionally encrypt their files, however, savings are lost. Message-locked encryption (the most prominent manifestation of which is convergent encryption) resolves this tension. However it is inherently subject to brute-force attacks that can recover files falling into a known set. The authors propose an architecture that provides secure de-duplicated storage resisting brute-force attacks, and realize it in a system called DupLESS.
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