I want to use a encryption algorithm "Rijndael" with SQL Server 2005.
someone already did?
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Isn't Rijndael is also known as AES?
AES is supported by SQL, documented here on MSDN
Your best bet here is to make some clr user defined functions which wrap the .net RijndaelManaged class methods...
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Lost encryption password
how do you encrypt an entire SQL 2005 database?
FILESTREAM and encrypted drives
Replace words at the beginning only(SQL SERVER 2005, SET BASED)