A method and system for re-encryption based on certificate proxy
A proxy re-encryption and certificate technology, which is applied to the public key of secure communication, user identity/authority verification, and key distribution, and can solve the problems of key escrow, complex certificate management, complex certificate management and key escrow.
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[0046] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0047] The certificate-based proxy re-encryption method of the present invention can be realized based on bilinear pairing. The basic definition of bilinear pairing and the properties it satisfies will be briefly introduced below.
[0048] Let G be an additive cyclic group of order p, G T is a multiplicative cyclic group of order p, and P is a generator of the group G, where p is a large prime number. Suppose G and G T The discrete logarithm problem on both groups is hard. If defined in group G and group G T Previous mapping e:G×G→G T Satisfy the following three properties, then the mapping is called a valid bilinear pairing. Bilinear pair e: G×G→G T is the Cartesian product G×G of the group G and itself to the group G T The mapping, that is, the bilinear pairing e:G×G→G T refers to the function z=e(P 1 ,P 2 ), where P 1 ,P 2 ∈G is an i...
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