I came across Arup Nanda and Steven Feuerstein's book Oracle PL/SQL for DBAs
the other day and made a note to first have a look on amazon and also to talk about it here. I have just ordered the book based on two things. The first is the Arup is a great author, I liked his writing style immensly in the Oracle Privacy Security Auditing: Includes Federal Law Compliance with HIPAA, Sarbanes Oxley & The Gramm Leach Bliley Act GLB
book. I bought and read that book when it came out and was impressed by the writing and the structure of the book. The second reason to buy the new book is that its also written by Steven who is also a great author and also a PL/SQL expert but mostly because there is a lot of Oracle security related topics in this new book. Arup and Steven cover all of the main security areas such as encryption, TDE, FGA and RLS. This should be a good practical book, I will let you know when it arrives and also I will let you know what i think of it when i have had time to have a proper look at it.