Encryption in Oracle9i Database
Let’s start our detailed discussion of encryption of Oracle data by looking at the DBMS_OBFUSCATION_TOOLKIT package. Although Oracle now recommends that you use the newer DBMS_CRYPTO package, most organizations have not yet converted their applications to use the new capabilities, so it makes sense to begin with the older package.
Tip
If you are running Oracle Database 10g and starting a new project, you will want to use the features described in the “Encryption in Oracle Database 10g” section. However, to make sure you are properly grounded in encryption concepts, you might still want to read this section first.