Privacy and Security Topics
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Figure 14.1: The concepts of plaintext, cipher, and ciphertext.
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Figure 14.2: Illustration of an encrypted message sent from Alice to
Bob.
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Figure 14.3: Alice sends a digitally signed confidential message to
Bob over the network. The solid arrows indicate Alice's computations
on her computer, and the dashed arrows show Bob's computations on his
computer. The computations performed by the encryption schemes are
not the same in both directions. To simplify the figure, we have
shown the computations going through the same boxes.
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Figure 14.4: A sample firewall.
© McGraw-Hill 1997.
All rights reserved.
This presentation accompanies the book "In-line/On-line:
Fundamentals of the Internet and World Wide Web" (ISBN 0-072-90685-5)
written by Raymond Greenlaw and Ellen Hepp.