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The offline private key protocol (OPKP) is a cryptographic protocol to prevent unauthorized access to back up or archive data. The protocol results in a public key that can be used to encrypt data and an offline private key that can later be used to decrypt that data. The protocol is based on three rules regarding the key. An offline private key should: * not be stored with the encrypted data (obviously) * not be kept by the organisation that physically stores the encrypted data, to ensure privacy * not be stored at the same system as the original data, to avoid the possibility that theft of only the private key would give access to all data at the storage provider; and to avoid that when the key would be needed to restore a backup, the key would be lost together with the data loss that made the restore necessary in the first place To comply with these rules, the offline private key protocol uses a method of asymmetric key wrapping. == Security == As the protocol does not provide rules on the strength of the encryption methods and keys to be used, the security of the protocol depends on the actual cryptographic implementation. When used in combination with strong encryption methods, the protocol can provide extreme security. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「offline private key protocol」の詳細全文を読む スポンサード リンク
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