If you are using the Oracle Database and interested in encryption you should already using Oracle Transparent Data Encryption (TDE). I have already put 2 blog posts on how to acclerate TDE with Intel AES-NI here Real World Database Encryption Performance with Intel AES-NI Pt 1 and here Real World Database Encryption Performance with Intel AES-NI Pt 2.

To see how this works in a real world environment Dupont conducted a Proof of Concept with Oracle TDE using Intel AES-NI and in this white paper Increasing Security by Accelerating Data Encryption with Intel® Advanced Encryption Standard New Instructions (Intel® AES-NI): Testing by DuPont and Intel Corporation you can see how Dupont improved Encryption and Decryption performance by 300%.