Paper 2012/419

DAC-MACS: Effective Data Access Control for Multi-Authority Cloud Storage Systems

Kan Yang, Xiaohua Jia, and Kui Ren

Abstract

Data access control is an effective way to ensure the data security in the cloud. However, due to data outsourcing and untrusted cloud servers, the data access control becomes a challenging issue in cloud storage systems. Existing access control schemes are no longer applicable to cloud storage systems, because they either produce multiple encrypted copies of the same data or require a fully trusted cloud server. Ciphertext-Policy Attribute-based Encryption (CP-ABE) is a promising technique for access control of encrypted data. It requires a trusted authority manages all the attributes and distributes keys in the system. In cloud storage systems, there are multiple authorities co-exist and each authority is able to issue attributes independently. However, existing CP-ABE schemes cannot be directly applied to the access control for multi-authority cloud storage systems, due to the inefficiency of decryption and revocation. In this paper, we propose DAC-MACS (Data Access Control for Multi-Authority Cloud Storage), an effective and secure data access control scheme with efficient decryption and revocation. Specifically, we construct a new multi-authority CP-ABE scheme with efficient decryption and also design an efficient attribute revocation method that can achieve both forward security and backward security. The analysis and the simulation results show that our DAC-MACS is highly efficient and provably secure under the security model.

Metadata
Available format(s)
-- withdrawn --
Category
Cryptographic protocols
Publication info
Published elsewhere. Unknown status
Keywords
Access ControlCP-ABEDecryption OutsourcingAttribute RevocationMulti-authority Cloud
Contact author(s)
kanyang3 @ student cityu edu hk
History
2014-02-10: withdrawn
2012-08-01: received
See all versions
Short URL
https://ia.cr/2012/419
License
Creative Commons Attribution
CC BY
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