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SQL Server versions with data encryption/decryption support

Our requirement is related to comparison of encrypted column values. Here is the logic:

1. Data in column A in table T1 is encrypted
2. Data in column B in table T2 is normal text. Its size is varchar(6)
3. One of the conditions in our WHERE clause is to compare the first 6 characters of column A in table T1 with column B in table T2

How do I acheive that? Is there any built-in SQL Server function for encryption/decryption? The query is part of stored procedure. Triple DES is the algorithm used for data encryption. We are using SQL Server 2000. Any help is greatly appreciated!

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SQL Server 2005 has built in support for encryption/decryption. SQL Server 2000 did not. For SQL Server 2000, can I suggest you add another column (ie. denormalize the data) which is the first 6 chars of column A, if your security permits that and use it in the WHERE clause.

This was first published in December 2005

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