CONVERSION KEY GENERATION DEVICE, CIPHERTEXT CONVERSION DEVICE, PRIVACY-PRESERVING INFORMATION PROCESSING SYSTEM, CONVERSION KEY GENERATION METHOD, CIPHERTEXT CONVERSION METHOD, AND COMPUTER
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机译：转换密钥生成设备，密文转换设备，隐私保护信息处理系统，转换密钥生成方法，密文转换方法和计算机
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摘要
A key acquisition unit (411) acquires a decryption key ski in a pair of a conversion source and a public key pkj in a pair of a conversion target, out of a plurality of pairs of a decryption key and a public key. A conversion key generation unit (412) encrypts the decryption key ski acquired by the key acquisition unit (411) with the public key pkj, so as to generate a conversion key rki→j for converting a ciphertext encrypted with a public key pki in the pair of the conversion source into a converted ciphertext that can be decrypted with a decryption key skj in the pair of the conversion target. An output unit (413) outputs the conversion key rki→j generated by the conversion key generation unit (412).
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机译：密钥获取单元（ 411 ）获取一对转换源中的解密密钥sk i 和一对公共密钥pk j 解密密钥和公共密钥的多对中的转换目标的密钥。转换密钥生成单元（ 412 ）用公钥pk <加密由密钥获取单元（ 411 ）获取的解密密钥sk i 。 Sub> j ，以便生成转换密钥rk i→j ，用于转换在转换对中用公钥pk i 加密的密文源转换为可以使用转换目标对中的解密密钥sk j 解密的转换后的密文。输出单元（ 413 ）输出由转换密钥生成单元（ 412 ）生成的转换密钥rk i→j 。
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