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    • 9. 发明申请
    • SIMILARITY DEGREE CALCULATION SYSTEM, SIMILARITY DEGREE CALCULATION APPARATUS, COMPUTER PROGRAM, AND SIMILARITY DEGREE CALCULATION METHOD
    • 相似度计算系统,相似度计算设备,计算机程序和相似度计算方法
    • US20130318351A1
    • 2013-11-28
    • US13982546
    • 2011-02-22
    • Takato HiranoNori MatsudaTakashi ItoMitsuhiro HattoriTakumi Mori
    • Takato HiranoNori MatsudaTakashi ItoMitsuhiro HattoriTakumi Mori
    • H04L9/32
    • H04L9/32H04L9/008H04L9/3073H04L9/3231H04L2209/34
    • Based on an encrypted feature vector (comparison ciphertext) encrypted with a public key of a decryption apparatus and an encrypted feature vector (target ciphertext) encrypted with the public key of the decryption apparatus, and a random number (temporary key) generated by a random number generation unit (temporary key generation unit), an encrypted random similarity degree calculation unit (interim similarity degree ciphertext calculation unit) performs calculation for calculating a similarity degree in a first stage, with two encrypted feature vectors kept encrypted, thereby calculating a second challenge. The decryption apparatus decrypts the second challenge with a secret key sk of the decryption apparatus, and performs calculation for calculating the similarity degree in a second stage with a result of the decryption kept encrypted with the temporary key, thereby calculating a second response. A plaintext similarity degree extraction unit (similarity degree calculation unit) decrypts the second response with the temporary key, thereby calculating a similarity degree.
    • 基于用解密装置的公开密钥加密的加密特征向量(比较密文)和用解密装置的公开密钥加密的加密特征向量(目标密文),以及随机数(临时密钥) 数字生成单元(临时密钥生成单元),加密的随机相似度计算单元(临时相似度密文计算单元)进行用于计算第一级中的相似度的计算,其中两个加密的特征向量保持加密,从而计算第二挑战 。 解密装置用解密装置的秘密密钥sk解密第二质询,并且利用临时密钥进行解密的结果进行第二阶段的相似度的计算,计算第二响应。 明文相似度提取单元(相似度计算单元)用临时密钥对第二响应进行解密,从而计算相似度。