If the letters are in the same row and in the first or last columns for example LA, you would translate it to YL.
For example, if you are trying to encrypt the letters IM, it would be translated to KP. If two letters are located in the same row, you would shift one position to the right. So the first pair will be encrypted to KB. Then you follow the E left to the H column and you get the letter B. You start by looking at the H and following it to the E column and you get the letter K. The way you encrypt each pair is by looking at their locations in the grid, so HE forms a 2×3 rectangle. Now to encrypt our message, we will look at each pair of letters at a time. For our example, we will use the keyword LYON and set up a grid first.
The encryption process has a specific algorithm. Note that it was not necessary to put an X between the two L’s in the word BELL because they were in two separate digraphs. The sentence would then be broken apart into: HERANGTHEBELLATSEVENPM So for this example our sentence will be HE RANG THE BELL AT SEVEN PM
Now the only thing left is to encrypt the message. Now there are a few restrictions that apply here: Any double letters are separated by the letter X, and if you have an odd number of letters in your message, you add an extra X at the end to make it even, for example, the word BELL would be written as BE LX LX. When doing this, you have to disregard all punctuation and write out any numbers that may be included. The next step to setting up this cipher is to split up your message into two-letter pairs called digraphs. The rules for the keyword apply here as well with the addition of one new rule: If any letter is repeated in the key, it is eliminated, the entire grid has to contain all of the letters except for J since it is represented by the letter I, and finally the key cannot contain the letters J and I. Similar to the Keyword Cipher, the Playfair cipher also uses a keyword. This will of course exclude a letter, but in this cipher, the letters I and J are combined to represent one letter. The structure of the Playfair cipher is a 5×5 grid of the English alphabet. What I really admire about this cipher is how simple it can seem, but is actually difficult to decipher. He was able to send a message encrypted using this cipher when his PT-109 sank in the Solomon Islands and managed to get his crew and himself rescued. Kennedy during World War II (Lyons, n.d.). One of the most famous uses of the Playfair Cipher involved John F. After all, the invention of the telegraph was a game-changer in the world of cryptography.
In addition, his work on the telegraph may have led to the creation of the Playfair cipher. This was one of his greatest inventions that led to his popularity. He made a revolutionary contribution with his invention of the stereoscope in 1838 (Banerjee, 2014). Wheatstone was also an important figure in the study of vision. This is what makes the Playfair cipher stand out among the other ciphers.Ĭharles Wheatstone may be more famous for his contributions to the invention of the telegraph, but what some may not know is that he invented the Playfair cipher, which he named after his friend, Lyon Playfair. What is the best way to keep your secret messages safe? Using a cipher that is deceptively simple. “Good Bye.” by Zarko Drincic via Flickr CC.
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