Proxy re-encryption method and system on basis of certificate conditions
A proxy re-encryption and conditional technology, applied in the field of information security, can solve problems such as non-simplification and complicated certificate management process
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[0071] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0072] The proxy re-encryption method based on the certificate condition of the present invention can be realized based on the bilinear pairing. The following briefly introduces the relevant concepts of the bilinear pairing and the properties that need to be satisfied:
[0073] Order G 1 , G 2 is a multiplicative cyclic group of order p, where p is a prime number and g is G 1 generator of . Suppose G 1 and G 2 The discrete logarithm problem on both groups is hard. Define the bilinear map on the group as: e:G 1 ×G 1 →G 2 , and satisfy the following properties:
[0074] 1. Bilinear: e(g a , g b )=e(g,g) ab , for all a,b∈Z p * and g∈G 1 are established.
[0075] 2. Non-degenerate: where 1 is G 2 unit element.
[0076] 3. Computability: There exists an efficient algorithm to compute e.
[0077] It can be noticed that e is commutati...
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