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Security notions for cloud storage and deduplication. (English) Zbl 1443.94048
Baek, Joonsang (ed.) et al., Provable security. 12th international conference, ProvSec 2018, Jeju, South Korea, October 25–28, 2018. Proceedings. Cham: Springer. Lect. Notes Comput. Sci. 11192, 347-365 (2018).
Summary: 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.
For the entire collection see [Zbl 1398.94007].
MSC:
94A60 Cryptography
68P25 Data encryption (aspects in computer science)
68P20 Information storage and retrieval of data
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