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Comprehensive Guide to Cryptography and Security Protocols

Explore the fundamentals of symmetric and public-key cryptography, authentication methods, key management, and security protocols in the internet. Delve into encryption techniques, cipher operations, and algorithm modes. Understand the complexities of DES and RSA encryption, along with practical examples of substitution ciphers and block cipher operations. Learn how to secure communication channels and protect data integrity with message authentication. Stay informed about the latest advancements in securing digital information.

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Comprehensive Guide to Cryptography and Security Protocols

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  1. PART VII Security

  2. Security Topics

  3. Chapters Chapter 29 Cryptography Chapter 30 Message Authentication, User Authentication, and Key Management Chapter 31 Security Protocols in The Internet

  4. Chapter 29 Cryptography

  5. 29.1 Introduction Introduction to Cryptography

  6. Figure 29.1Cryptography components

  7. Figure 29.2Encryption and decryption

  8. Note: In cryptography, the encryption/decryption algorithms are public; the keys are secret.

  9. 29.2 Symmetric-Key Cryptography Traditional Cipher Block Cipher Operation Modes

  10. Figure 29.3Symmetric-key cryptography

  11. Note: In symmetric-key cryptography, the same key is used by the sender (for encryption) and the receiver (for decryption). The key is shared.

  12. Note: In symmetric-key cryptography, the same key is used in both directions.

  13. Note: Symmetric-key cryptography is often used for long messages.

  14. Figure 29.4Caesar cipher

  15. Figure 29.5Example of monoalphabetic substitution

  16. Note: In monoalphabetic substitution, the relationship between a character in the plaintext to the character in the ciphertext is always one-to-one.

  17. Figure 29.6Vigenere cipher

  18. Note: In polyalphabetic substitution, the relationship between a character in the plaintext and a character in the ciphertext is one-to-many.

  19. Figure 29.7Transpositional cipher

  20. Figure 29.8Block cipher

  21. Figure 29.9P-box

  22. Figure 29.10S-box

  23. Figure 29.11Product block

  24. Figure 29.12DES

  25. Figure 29.13General scheme of DES

  26. Figure 29.14Iteration block

  27. Figure 29.15Triple DES

  28. Note: The DES cipher uses the same concept as the Caesar cipher, but the encryption/decryption algorithm is much more complex due to the sixteen 48-bit keys derived from a 56-bit key.

  29. Figure 29.16ECB mode

  30. Figure 29.17CBC mode

  31. Figure 29.18CFM

  32. Figure 29.19CSM

  33. 29.3 Public-Key Cryptography RSA Choosing Public and Private Keys

  34. Figure 29.20Public-key cryptography

  35. Note: Public-key algorithms are more efficient for short messages.

  36. Figure 29.21RSA

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