"To secure sensitive data, Oracle provides
developers with the DBMS_OBFUSCATION_TOOLKIT, an
industrial strength version of the DBMS_RANDOM
package. You may feel the need of a decoder just to
keep track of all the acronyms and to decrypt the
errors in Oracle's sample code, but once you see how
easy it is to use, you'll be able to take Oracle's
code example and modify it for your own use."
writes Steve Callan in an
article for DatabaseJournal.com.