A security engineering book available online for FREE: <A HREF="http://www.cl.cam.ac.uk/~rja14/book.html" target="_blank">http://www.cl.cam.ac.uk/~rja14/book.html</A> Of course those who do not like Ross Anderson will poo-poo this free book. But we all know those who poo-poo it will offer their free book too!