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The decryption overhead for users is largely eliminated by outsourcing the undesirable bilinear pairing operations to the cloud servers.
As the CP-ABE scheme views access policy in normal forms, the length of ciphertext is independent against the number of attributes in the policy besides having constant number of pairing operations for both encryption and decryption functions.
Unlike existing protocols in VANETS, the proposed protocol is not built on expensive bilinear pairing operations.
The terms are extended by adding pairing operations and projections and a special element of type 1.
Compared to [4], the proposed protocol offers lower communication overhead since PBS [4] is build based on expensive pairing operations.
However, the proposed protocol is built based on expensive pairing operations which might not be efficient due to voluminous sizes of various files.
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Our protocol is efficient and practical, because it requires only one pairing operation and five multiplications by each party.
Several techniques have been developed to void or to automatically obtain pairing operation [5 7].
There are three exponentiation operations and one pairing operation; three random numbers are chosen in Setup procedure.
[6] The standard presentation of set theory defines and studies relations, functions, and the like in terms of this pairing operation.
We mentioned in note [2] that it is possible to alter the pairing operation in such a way that one may prove many of the results that our treatment obtains only by using ZFA.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com