Fog collaborative cloud data sharing method based on attribute-based encryption
An attribute-based encryption, cloud data technology, applied in digital transmission systems, key distribution, can solve problems such as high computing and storage costs, inability to achieve personalized and specialized access control, resource consumption, etc.
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[0056] A fog collaborative cloud data sharing method based on attribute-based encryption, specifically comprising the following steps:
[0057] Step 1: System initialization;
[0058] a1: The authority generates the system public key PK and the system master key MSK through the algorithm ACgen(U,λ);
[0059] The authority enters the global attribute U and the safety factor λ into the algorithm ACgen(U,λ), where U={u 1 ,...,u n},λ∈Z q , and choose two cyclic additive groups of order p and and a bilinear map The generator is g, n random group elements Corresponding to the n attributes in U, the public key PK is output through the formula (1); the authority randomly selects the element α∈Z q , output the system master key MSK through formula (2);
[0060] PK=g,g α , e(g,g) α , h 1 ,...,h n (1);
[0061] MSK=g α (2);
[0062] a2: The authority runs the algorithm CSgen according to the formula (3) to generate the private key SK of the cloud service provider and...
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