I have used the asp.net membership and the user login system and can see that the password and security answer are encrypted.

Is it possible to use the encryption on other columns, and in other tables?

If so how do I do it?

Also has anyone measured the performance hit on this encryption?

Thanks

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Here is a little example from BOL from the EncryptByKey (Transact-SQL) topic
USE AdventureWorks;
GO

-- Create a column in which to store the encrypted data.
ALTER TABLE HumanResources.Employee
    ADD EncryptedNationalIDNumber varbinary(128);
GO

-- Open the symmetric key with which to encrypt the data.
OPEN SYMMETRIC KEY SSN_Key_01
   DECRYPTION BY CERTIFICATE HumanResources037;

-- Encrypt the value in column NationalIDNumber with symmetric key
-- SSN_Key_01. Save the result in column EncryptedNationalIDNumber.
UPDATE HumanResources.Employee
SET EncryptedNationalIDNumber
    = EncryptByKey(Key_GUID('SSN_Key_01'), NationalIDNumber);
GO


David Lundell
Principal Consultant and Trainer
www.mutuallybeneficial.com