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Encryption
The previous sections of this chapter all deal with the need to protect access to data
in the Oracle database. There may be times when youwant to take the extra step of
protecting the actual data values from unauthorized viewing by encrypting the data.
Oracle has provided data encryption for several releases, but Oracle Database 10g
Release 2 included a significant new feature called Transparent Data Encryption.
Prior to the introduction of this feature, encrypted data stored in the Oracle database
had to be decrypted by an application before it could be used. This scenario
caused a number of limitations, the most prominent being that decryption of data
was done by applications. If youwanted to start encrypting a particular piece of data,
you would have to change all data access routines in every application that used the
data. This limitation alone made it difficult to consider adding encryption to existing
data.
With Transparent Data Encryption, the database does the work of encrypting and
decrypting data automatically.


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