Data Encryption

Hello.
Although I red the docs about Transparent Data Encryption, Data Vault and some encryption packages, I could't find an info about how to encrypt data in tables so that when someone runs :
SELECT username FROM sometableon the encrypted table where
username is varchar2, he gets encrypted data,something like:
username
Ab34SferT
....Also it would be great if I could use WHERE clouse on the encrypted column in the query above using nonencrypted data format.
something like :
SELECT username FROM sometable WHERE username='JONES'and to get :
username
Ab34SferTIf I could achive this somehow, please explain me how.
Thank You.

Thank you damorgan, i was guessing dbms_crypto will do the trick.
Also, does anyone have some good example doc about using dbms_crypto ?
I searched the web but have found nothing containing explanation with good examples.
Toni.

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