Multi-keyword searchable encryption method supporting numerical attribute comparison
A technology of numerical attributes and encryption methods, applied in the field of information security
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[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0052] Such as figure 1 As shown, the present invention provides a multi-keyword searchable encryption method that supports numerical attribute comparison, comprising the following steps:
[0053] Step 1, system initialization: such as figure 1 As shown in ① in , the third-party trusted entity TTP generates the public parameter pm and the master key msk according to the security parameter k, where:
[0054] Public parameter pm={G,G T ,e,p,g,h 1 ,H 2 , g a , g b , g c}, master key msk={a,b,c};
[0055] where G is the additive cyclic group of order p, g is the generator of G, and G T is the p factorial cyclic group, e is the bilinear map G×G→G T , H 1 Indicates that the collection {0,1} * Hash function mapped to the additive cyclic group G of order p, H 2 Indicates that the collection {0,1} * Mapped to the integer ring Z of order p ...
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