Column-Level Encryption
Column-level encryption (sometimes referred to as cell-level encryption) was introduced in Microsoft SQL Server 2005 and is still fully supported in SQL Server 2008 R2. Column-level encryption offers a more granular level of encryption than TDE, allowing you to encrypt specific data columns in the context of specific users.
Column-level encryption is implemented as a series of built-in functions and a key management hierarchy. Implementing column-level encryption is a manual process that requires a re-architecture of the application to call the encryption and decryption functions explicitly when storing or retrieving data. In addition, the tables must be modified to store the encrypted data as varbinary. The data is ...
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