TAILIEUCHUNG - Lecture Network security: Chapter 13 - Dr. Munam Ali Shah

The topics discussed in this chapter are: Our discussion on more cryptographic schemes will continue, poly-alphabetic cipher will also be discussed, we will explore one time pad and OTP, the security and practicality of OTP will also be discussed, transposition cipher with an example of rail fence cipher will form part of our today’s lecture. | Network Security Lecture 13 Presented by: Dr. Munam Ali Shah Part 2 (b) Cryptography as a Network Security Tool Summary of the previous lecture We discussed more examples of Shift/Ceaser Cipher We also discussed examples of mono-alphabetic cipher and poly-alphabetic cipher More precisely, we explored how strong or weak a certain cryptographic scheme/algorithm can be. Outlines of today’s lecture Our discussion on more cryptographic schemes will continue. Poly-alphabetic cipher will also be discussed We will explore One Time Pad and OTP. The security and practicality of OTP will also be discussed. Transposition Cipher with an example of Rail Fence Cipher will form part of our today’s lecture. Objectives You would be able to present an understanding of transposition cipher. You would be able use Rail Fence cipher Polyalphabetic Ciphers Improve security using different cipher letters for different occurrences of same plaintext letter Make cryptanalysis harder with more letters to guess .

• An ninh - Bảo mật
• Network security
• Lecture Network security
• Computer network
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• Transposition cipher
• Rail Fence cipher
• Web security
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