I hope my post is in the right section. I need some help with decoding a Playfair code.
I only have the ciphertext which is 22 lines long. What's the best way to do this? I red that I have to do some frequency analysis of the English bigrams which I did. There's one combination which has the highest frequency. I changed this combination by 'th', but now I have three combinations with the same frequency. How can I solve this problem?