Out of the box, Oracle does not encrypt data transmitted from the Oracle database to the application. One of the mechanisms that you can use it to employ Oracle's data encryption routines with the DBMS_OBFUSCATION_TOOLKIT package. The data would be stored in the database in encrypted format. This has the advantage of safeguarding your data even if someone breaks in to your database. However, the data would be unencrypted in the database and the transmitted across the network in unencrypted format. To encrypt data transmitted across the network, you'll want to install and configure Oracle's Advanced Security option.
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