CP-ABE with Efficient Revocation Based on the KEK Tree in data Outsourcing System

CP-ABE (ciphertext-policy attribute-based encryption) is a promising encryption scheme. In this paper, a highly expressive revocable scheme based on the key encryption keys (KEK) tree is proposed. In this method, the cloud server realizes the cancellation of attribute-level users and effectively red...

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Bibliographic Details
Main Authors: Wang, Xi-Kun, Sun, Xin
Format: Conference Proceeding
Language:English
Subjects:
Attribute Revocation
Cloud Storage
Computational modeling
CP-ABE
Data models
Distributed databases
Encryption
KEK
Outsourcing
Safety
Security
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Summary:CP-ABE (ciphertext-policy attribute-based encryption) is a promising encryption scheme. In this paper, a highly expressive revocable scheme based on the key encryption keys (KEK) tree is proposed. In this method, the cloud server realizes the cancellation of attribute-level users and effectively reduces the computational burden of the data owner and attribute authority. This scheme embeds a unique random value associated with the user in the attribute group keys. The attribute group keys of each user are different, and it is impossible to initiate a collusion attack. Computing outsourcing makes most of the decryption work done by the cloud server, and the data user only need to perform an exponential operation; in terms of security, the security proof is completed under the standard model based on simple assumptions. Under the premise of ensuring security, the scheme in this paper has the functions of revocation and traceability, and the speed of decryption calculation is also improved.
ISSN:2161-2927
DOI:10.23919/CCC52363.2021.9549836