Holden; Web Security, Network Defense and Countermeasures; Course Technology; 2003; ISBN 0619131241.
Ferguson and Schneier; Practical Cryptography; Wiley; 2003; ISBN 0-471-22357-3.
Garfinkel with Spafford; Web Security, Privacy & Commerce; O'Reilly; 2002; ISBN 0596000456.
Cole, Newfield, Millican; GSEC Security Essentials Toolkit; Que/SANS Press; 2002; ISBN 0789727749.
Schneier; Applied Cryptography: Protocols, Algorithms, and Source Code in C, 2nd Edition; Wiley; 1995; ISBN 0471117099.
Texts supplemented with outside and online materials .