SECRET CALCULATION INFORMATION EXCHANGING SYSTEM, DATA PROCESSOR, SECRET CALCULATION INFORMATION EXCHANGING METHOD, SECRET CALCULATION INFORMATION EXCHANGING PROGRAM AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a secret calculation information exchanging system that secretly calculates a result after applying a calculation with setting secret data held by multiple institutions as input, with neither transmitting and receiving a ciphertext nor allowing unrelated information to be known to others.;SOLUTION: A secret calculation information exchanging system 1 consists of data processors 100 respectively installed at two or more institutions. The data processors 100 respectively have: a storage part 130 that stores secret data and a fixed ciphertext string; a fixed ciphertext decrypting part 111 that uses a decryption key to decrypt part of the fixed ciphertext and calculates a result of fixed ciphertext decryption; and a final result calculation part 112 that applies a calculation to the result of fixed ciphertext decryption and calculates a final result. Here, the secret data is undisclosed information that includes customer information being information on a customer using each institution, a secret vector for the customer information rearranged and aligned upon obtaining recognition common between both institutions, and the like.;SELECTED DRAWING: Figure 6;COPYRIGHT: (C)2017,JPO&INPIT