| Kaufman, Charlie; Perlman, Radia; and Speciner, Mike, Network Security: Private Communications in a Public World , 1st edition, Prentice Hall, 1995, ISBN 0-13-061466-1, 2nd edition, Prentice Hall 2002, ISBN 0-13-046019-2. Garfinkel, Simon and Spafford, Gene, Practical UNIX and Network Security , 2nd edition, O'Reilly and Associates Inc., ISBN 1-56592-148-8. Singh, Simon, The Code Book , Fourth Estate Limited, 1999, ISBN 1-85702-879-1. |
