![]() SQL Server uses the ANSI X.917 hierarchical model for key management which has certain advantages over a flat single-model for encryption keys, particularly in terms of key rotation. By rotating your keys regularly your keys become a moving target, much harder to hit. Leave the same encryption key in place for lengthy periods of time give hackers and other malicious persons the time to attack it. Key rotation based on a regular schedule should be part of the IT policy. Rotate the encryption keys on regular basis.This is important we can restore them in case of corruption or disaster recovery scenarios Backup encryption keys and secure them.Limit encryption key access to only those who really need it.Managing improperly the encryption keys can compromises the entire security strategy. Encryption key management is one of the toughest tasks in cryptography. In this hierarchy each encryption key is protected by its parent. Then if we traverse the tree from the top to bottom we can find the service master key, the database master key, the server certificate or the asymmetric key and finally the database encryption key (AKA the DEK). ![]() The database key is a part of the hierarchy of SQL Server encryption tree with at the top of the tree the DPAPI. Transparent Data Encryption requires the creation of a database key encryption.
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