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Ciphertext Comparison System, Ciphertext Comparison Method, Encryption Device and Ciphertext Comparison Device, and Control Method and Control Program Therefor
Ciphertext Comparison System, Ciphertext Comparison Method, Encryption Device and Ciphertext Comparison Device, and Control Method and Control Program Therefor
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机译：密文比较系统，密文比较方法，加密装置和密文比较装置及其控制方法和控制程序
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摘要
An apparatus of this invention is directed to a ciphertext generation apparatus that can compare the magnitudes of encrypted numerical values and largely reduce the risk of information leakage while maintaining the confidentiality. This ciphertext generation apparatus includes a derived key generator that generates a derived key based on a main key and a document, an auxiliary derived key generator that generates an auxiliary derived key based on the main key, the document, and the derived key, an identifier-specific ciphertext generator that generates, based on an identifier of the document, the derived key, and the auxiliary derived key, an identifier-specific ciphertext in which the identifier is encrypted, and a relative value ciphertext generator that generates, based on the identifier and the derived key, a relative value ciphertext in which a relative value generated from the main key, the document, and the derived key is encrypted. A character string including the identifier-specific ciphertext and the relative value ciphertext is generated as a ciphertext for the document.
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