1. Feghhi, J.; Williams, P: Digital Certificates: Applied Internet Security. Addison-Wesley, 1999.

2. Ford, W; Baum, M. S.: Secure Electronic Commerce. Prentice Hall, 1997.

3. Garfinkel, Simson; Eugene Spafford: Web Security and Commerce. O'Reilly and Associates, 1997.

4. Stallings, William: Cryptography and Network Security. Principles and practice. Prentice Hall, 1999.

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