http://www.java2s.com/Tutorial/Oracle/0601__System-Packages/DBMSCRYPTOencryptaes128DBMSCRYPTOchaincbcDBMSCRYPTOpadpkcs5.htm - DBMS Crypto

http://www.dba-oracle.com/t_dbms_crypto.htm - crypto
http://www.orafaq.com/usenet/comp.databases.oracle.misc/2007/03/01/0001.htm - crypto