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数据库加密：
http://blog.csdn.net/u012992506/article/details/25283035
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create master key encryption by password=‘P@ssw0rd‘
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backup master key to file=‘d:\smk.bak‘
encryption by password=‘P@ssw0rd‘
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open master key decryption by password=‘P@ssw0rd‘
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CREATE CERTIFICATE BackupCertificater
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WITH SUBJECT = ‘Backup Encryption Certificate‘;
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GO
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BACKUP DATABASE Test TO DISK =‘d:\Test_Encrypted.bak‘WITH COMPRESSION, ENCRYPTION (ALGORITHM = AES_256, SERVER CERTIFICATE = BackupCertificater);
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