![]() ![]() ‘M’ is substituted by ‘L’, because ‘L’ is in the same row as M and in the same column as ‘Y’ (the other letter from the pair). Not in the same column and not in the same row. ![]() 5×5 Playfair matrix using the key “secret” So, for easy reference, I’ll repeat the picture of the matrix in this section. ![]() Encryption processįirst, we need to have the matrix. Now we are ready to start the encryption. Here, we use a “filler” to separate the two ‘S’. Let’s divide our plain text into a sequence of pairs of letters.Īs you can see, we have the same letter together in a pair. As per the second rule, we encrypt two letters at a time. Let’s assume we want to encrypt this message (plain text): “my secret message”. Notice after the ‘R’, we add the ‘T’ because the ‘E’ was previously added.įrom there, we complete the matrix with the alphabet, without repeating letters and using ‘I’ and ‘J’ as the same character. 5×5 Playfair matrix using the key “secret”Īs you can see in the picture above, we first add each letter from the secret key (without repeating a letter). ![]() If the secret key is “secret”, the matrix should look as in the picture below. Let’s start with an example of how the matrix should look like. Keep reading for you to see examples of each step and rule, and the full Python code for the cipher.
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