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Security notions for cloud storage and deduplication

Boyd, Colin Alexander; Davies, Gareth Thomas; Gjøsteen, Kristian; Raddum, Håvard; Toorani, Mohsen
Journal article, Peer reviewed
Accepted version
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Permanent link
http://hdl.handle.net/11250/2594624
Issue date
2018
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  • Publikasjoner fra CRIStin - NTNU [15263]
  • Institutt for informasjonssikkerhet og kommunikasjonsteknologi [1410]
  • Institutt for matematiske fag [1188]
Original version
Lecture Notes in Computer Science. 2018, 11192 LNCS 347-365.   10.1007/978-3-030-01446-9_20
Abstract
Cloud storage is in widespread use by individuals and enterprises but introduces a wide array of attack vectors. A basic step for users is to encrypt their data, yet it is not obvious what security properties are required for such encryption. Furthermore, cloud storage providers often use techniques such as data deduplication for improving efficiency which restricts the application of semantically-secure encryption. Generic security goals and attack models have thus far proved elusive: primitives are considered in isolation and protocols are often proved secure under ad hoc models for restricted classes of adversaries.

We formally model natural security notions for cloud storage and deduplication using a generic syntax for storage systems. We define security notions for confidentiality and integrity in encrypted cloud storage and determine relations between these notions. We show how to build cloud storage systems that satisfy our defined security notions using standard cryptographic components.
Publisher
Springer, Cham
Journal
Lecture Notes in Computer Science

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