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ENCRYPTED DATA STORAGE SERVER SYSTEM, ENCRYPTED DATA STORAGE METHOD, AND RE-ENCRYPTION METHOD
ENCRYPTED DATA STORAGE SERVER SYSTEM, ENCRYPTED DATA STORAGE METHOD, AND RE-ENCRYPTION METHOD
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机译:加密数据存储服务器系统,加密数据存储方法和重新加密方法
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摘要
PROBLEM TO BE SOLVED: To provide an encrypted data storage server system with high secrecy so as not to impose much load on users.;SOLUTION: The user 41 transmits only a difference between a new key and an old key for re-encryption to a proxy server 20. The proxy server 20 directly applies re-encryption to encrypted data by using only the difference of the transmitted keys without decoding the encrypted data stored in a storage server 10. The storage server 10 stores the encrypted data re-encrypted by the proxy server 20.;COPYRIGHT: (C)2005,JPO&NCIPI
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