_____________________________________________________________________________________
1. Charlie Kaufman, Radia Perlman, Mike Speciner. Network Security: Private Communication in a Public World. Prentice Hall; Second edition (2002). ISBN: 0130614661.
2. Williams Stallings. Cryptography and network security. Principles and practice. Fourth edition. Prentice Hall 2006. ISBN: 0131873164 ( Williams Stallings Web ).
3. J. Manuel Lucena. Criptografía y seguridad en computadores. (URL).
4. Alfred Meneses. Handbook of applied cryptography. CRC Press. 1996. (URL).