Efficient CP-ABE Scheme With Shared Decryption in Cloud Storage

Attribute-based encryption (ABE) is a preferred technology used to access control the data stored in the cloud servers. However, in many cases, the authorized decryption user may be unable to decrypt the ciphertext in time for some reason. To be on the safe side, several alternate users are delegate...

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Bibliographic Details
Published in:IEEE transactions on computers 2022-01, Vol.71 (1), p.175-184
Main Authors: Chen, Ningyu, Li, Jiguo, Zhang, Yichen, Guo, Yuyan
Format: Article
Language:English
Subjects:
ABE
Access control
Algorithms
ciphertext-policy
Cloud computing
Cloud storage
CPA-secure
Encryption
Generators
Logic gates
Messages
Security
Servers
shared decryption
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Summary:Attribute-based encryption (ABE) is a preferred technology used to access control the data stored in the cloud servers. However, in many cases, the authorized decryption user may be unable to decrypt the ciphertext in time for some reason. To be on the safe side, several alternate users are delegated to cooperate to decrypt the ciphertext, instead of one user doing that. We provide a ciphertext-policy ABE scheme with shared decryption in this article. An authorized user can recover the messages independently. At the same time, these alternate users (semi-authorized users) can work together to get the messages. We also improve the basic scheme to ensure that the semi-authorized users perform the decryption tasks honestly. An integrated access tree is used to improve the efficiency for our scheme. The new scheme is proved CPA-secure in the standard model. The experimental result shows that our scheme is very efficient on both computational overhead and storage cost.
ISSN:0018-9340
1557-9956
DOI:10.1109/TC.2020.3043950