Learn Playfair Cipher: Easy Step-by-Step Substitution Cipher Tutorial in Hindi 🔐

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Playfair Substitution Cipher https://youtu.be/w_xr7pj-O6c

Monoalphabetic Substitution Cipher https://youtu.be/Hw1T7GOnVW0

Caesar Cipher | Caesar Substitution Cipher https://youtu.be/2N9GlhysYJw


PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll

Caesar Cipher Tutorial : https://youtu.be/2N9GlhysYJw
Polyalphabetic Cipher Tutorial : https://youtu.be/Hw1T7GOnVW0

It is Best-known multiple-letter encryption
Treats digrams in the plaintext as single units and translates these units into ciphertext digrams
The Playfair algorithm is based on the use of a 5 × 5 matrix of letters constructed using a key.
Rules to construct Matrix : Fill the letters of the key (minus duplicates) from left to right and from top to bottom,
Then fill the remainder of the matrix with the remaining letters in alphabetic order.
The letters I and J count as one letter.

Plaintext is encrypted two letters at a time, according to the following rules:
Repeating letters that are in the same pair are separated with a filler letter, such as x, so that balloon would be treated as ba lx lo on.
Two letters that fall in the same row of the matrix, each replaced by the letter to the right, with the first element of the row circularly following the last. For example, ar is encrypted as RM.
Two plaintext letters that fall in the same column are each replaced by the letter With the top element of the column circularly following the last. For example, mu is encrypted as CM.
Each letter in a pair is replaced by the letter that lies in its own row and the column occupied by the other plaintext letter. Thus, hs becomes BP and ea becomes IM (or JM).