In the attribute encryption scheme based on the ciphertext policy,the central authorization center(CA),as an important organization involved in generating the private key of the user attribute,thus, the central anthorization center is required for the high security.In the traditional scheme, if the single CA is attacked, the security of the system can not be guaranteed.In order to solve this problem, the paper adopts the multi-authorization center.In this scheme, each CA calculates the decryption key of the user at the same time.The attribute authority(AA)manages the corresponding attribute set and divides the attribute weight according to the attribute set to realize weight attributes.By the theoretical analysis, the scheme not only ensures the security of the scheme,but also makes it more practical.
DU Ruizhong
,
ZHAO Fanghua
. Multi-center encryption scheme for weight attributes of ciphertext policy in cloud computing environment[J]. Journal of Hebei University(Natural Science Edition), 2017
, 37(5)
: 531
-536
.
DOI: 10.3969/j.issn.1000-1565.2017.05.013
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