[Semibug] Book recommendations on computer security?

[Jonathan Drews]

Folks:

 I recently bought "Practical UNIX & Internet Security" by Garfinkel
and Spafford. It was published in April, 2003.

 Can you recommend a more recent book? Spafford & Garfinkel has a lot
of good information but it may be dated.

--
Kind regards,
Jonathan