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Ciphertext search system, search information generating device, search execution device, search request apparatus, encrypted text search method, the search information generating method, search execution method, search request method, and program
Ciphertext search system, search information generating device, search execution device, search request apparatus, encrypted text search method, the search information generating method, search execution method, search request method, and program
PROBLEM TO BE SOLVED: To prevent estimation of a retrieval keyword by dictionary attack and suppress increase of storage capacity which is added in response to increase of a retrieval processing amount.;SOLUTION: In a ciphertext retrieval system 20, a retrieval information generation device 101 transmits a ciphertext C1 obtained by encrypting a plaintext M to a cipher information storage device 500, and a retrieval index C2 which is a set composed of information R1, information R2 obtained by encrypting the information R1 and information R3 for uniquely identifying the ciphertext C1 to a retrieval information storage device 400. A retrieval request device 200 transmits a retrieval query k* to a retrieval execution device 300. The retrieval execution device 300 acquires the retrieval index C2 from the retrieval information storage device 400, determines whether or not a decryption result R obtained by decrypting the information R2 matches the information R1, and transmits a matching retrieval index to the retrieval request device 200. The retrieval request device 200 acquires the ciphertext C1 identified by the information R3 from the cipher information storage device 500.;COPYRIGHT: (C)2013,JPO&INPIT
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