Now, in this example - our presumption that "e" is equal to "f" on the grounds the "f" is the most common letter in the cipher and that "e" is the most common letter in English was true - and "e" became our key to the cipher. In our example and using the above table, our "BMJ UIF LFCBC TFMMFS" clue becomes "ALI THE KEBAB SELLER". If you are enciphering a message, it would be the opposite way round. Remember - to decipher, you look at the ciphered message letter on the bottom and then read whatever the top letter is to read what it actually means. Now, we have this table we can see if we are correct in our presumption that "e" was indeed "f" in the cipher. So, if our cipher had the letter "Z" in it, for example, we could look for "Z" on the bottom row - look up and see that Z = Y. So, we now have a table of sorts where the ciphered letters are on the bottom row, and the corresponding alphabet letter is on the top. Next, under the letter "E", we write "F" because we think that letter "F" in the cipher is equal to "E" in the alphabet, and then fill out the rest of the alphabet starting from "F" and then looping back to the start once we reach "Z" to give us all letters like such:ī C D E F G H I J K L M N O P Q R S T U V W X Y Z A Once this presumption is made, we write out the entire alphabet in the correct order.Ī B C D E F G H I J K L M N O P Q R S T U V W X Y Z So, because "F" is our most common letter in the cipher - we can presume "F" = "E". It may turn out to not be the case, but it's a good place to start. Now, the letter "E" is the most common letter in the English language, so we always presume the most common letter in the cipher is "E" as our starting letter. Make a list of the letters and how many times they appear:Īs we can see, "F" is the most common letter within the cipher. For this example, the clue "BMJ UIF LFCBC TFMMFS" will be used. In order to decrypt a caesar shifted message, we must first count the number of times a letter appears within the cipher. They use a Caesar Shift in order to encrypt a NPC's name. In Old School RuneScape, ciphers are used as a step in a Treasure Trail. Ciphers are a method of encrypting information.
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