1. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Chapter 19 Data Encryption

2. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Figure 19-1 Concept of Encryption and Decryption

3. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Encryption/Decryption Methods Figure 19-2

4. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Monoalphabetic Substitution Figure 19-3

5. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Polyalphabetic Substitution Figure 19-4

6. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Transpositional Encryption Figure 19-

7. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Encoding/Decoding Figure 19-6

8. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Permutation Figure 19-7

9. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Substitution Figure 19-8

10. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Product Figure 19-9

11. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Exclusive OR Figure 19-10

12. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Rotation Figure 19-11

13. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 DES Figure 19-12

14. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Subkey Generation in DES Figure 19-13

15. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 One of the 16 Steps in DES Figure 19-14

16. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Public Key Encryption Figure 19-15

17. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 RSA Figure 19-16

18. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 RSA Encryption and Decryption Figure 19-17

19. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Security of RSA Figure 19-18

20. McGraw-Hill©The McGraw-Hill Companies, Inc., 2003 Signature Authentication Figure 19-19