This is a nice security paper from Sun, covers almost every aspect of java security: http://developer.java.sun.com/developer/onlineTraining/Security/Fundamentals/Security.html
I do not have a single link for internationalization, however if you go to developer.java.sun.com and look for Internationalization keyword, you will find a plenty of usefull links,
just couple of those,
chapter from the book of Monica Pawlan: http://developer.java.sun.com/developer/Books/Essentials/int.pdf
Internationalization tutorial: http://java.sun.com/docs/books/tutorial/i18n/index.html
I personally have to admit that I've missed both of my internationalization questions ;-( This was the only section where I've got 0%. Shame on me.
You should know, I beleive, what internationalization stands for, what it allows you to customize, labels formatting algorithms etc, and which classes packages provides you the means of maintaining internationalization needs, like SimpleDateFormat or java.util.* package.
I also would like to say that both of my questions were vague. So be careful.
Hopefully this will help.