Security in Computing, Third Edition, Charles P. Pfleeger and Shari L. Pfleeger.

Exploiting Software: How to Break Code, Greg Hoglund and Gary McGraw.
Beyond Fear, Bruce Schneier.

Cryptography and Network Security: Principles and Practice (3rd Ed.), W. Stallings.

Network Security Essentials (Second Edition), William Stallings.
Computer Security: Art and Science, Matt Bishop.

Network Security: Private Communication in a Public World, Second 
Edition,

Charlie Kaufman, et al.
Network Security: A Beginner’s Guide, Second Edition, Eric Maiwald.

Computers Under Attack: Intruders, Worms, and Viruses, Peter J. Denning, ACM
Press, New York, N.Y., 1990.

An Introduction to Computer Security: The NIST Handbook, Special Publication

800-12. A 290-page book in PDF format, available online at [NIST Handbook 04].

The following books concentrate on computer viruses.
Viruses Revealed, David Harley et al., Osborne/McGraw-Hill, 2001.
Introduction 13

Robert Slade’s Guide to Computer Viruses, 2nd edition, Robert M. Slade, Springer-
Verlag 1996.

Dr. Solomon’s Virus Encyclopedia, Alan Solomon S&S International, 1995.

A Short Course on Computer Viruses, 2nd edition, Frederick B. Cohen, New York,
NY, John Wiley, 1994.

PC Security and Virus Protection Handbook, Pamela Kane, M&T Books, 1994.

A Pathology of Computer Viruses, David Ferbrache, Springer-Verlag, 1992.
Computer Virus Handbook, Harold J. Highland, Elsevier, 1990 (a little outdated).

Rogue Programs: Viruses, Worms, and Trojans, Lance Hoffman (ed.) Van Nostrand
Reinhold (1990).