"Keeping your company's data and systems secure is a must for any Oracle DBA. Beyond patching known security flaws, there is a great deal you can do to protect your Oracle DBMS and applications from security breaches, both from inside and outside your organization. All this month, SearchOracle.com examined security issues and how they impact Oracle products and users. This special report compiles news, analysis, white papers and expert advice on this topic, including breaking articles and content from our archives, to help you conquer your daily security challenges. We've also updated our popular learning guide on Oracle security -- browse through it for even more tips and advice on passwords, encryption and more."
This is a good compilation of links to recent news and papers on Oracle security.