Network Security: Polyalphabetic Cipher (Vernam Cipher)
Topics discussed:
1) Classical encryption techniques and introduction to polyalphabetic substitution cipher.
2) Working of Vernam cipher with expression and diagram.
3) Significance of having a repeating keyword and non-repeating keyword.
4) Significance of having a random keyword whose length is as that of the length of the plain text.
5) Cryptanalytic difficulties of Vernam cipher with suitable explanation.

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