PPT Slide
S. Garfinkel and E.H. Spafford. Web Security & Com-merce. O'Reilly & Associates, Sebastopol, CA, 1996, ISBN 1565922697
W. Stallings. Cryptography and Network Security: Prin-ciples and Practice (2nd Edition). Prentice Hall, Upper Saddle River, NJ,1997, ISBN 0138690170
W. Ford and M. Baum. Secure Electronic Commerce: Building the Infrastructure for Digital Signatures and Encryption. Prentice Hall, Upper Saddle River, NJ,1997, ISBN 0134763424
J. Feghhi, J. Feghhi and P. Williams, Digital Certificates: Applied Internet Security, Addison-Wesely, Reading, MA, 1999, ISBN 0201309807