Transposition cipher8/5/2023 Then put the letter that appears next in the alphabet at the top of the second column, etc. ![]() All you do is start with the letter in the keyword that appears first in the alphabet, in this case G, and put this at the top of the first column. If you know the keyword, this process is fairly straight forward. Now that we have an encrypted piece of text, we need to know how to recover the actual message. OETNAEEYTEEX ASOTHTSNRNOE NERAEWETEEBX CYHSAUNEETTN WNADCDCPTHDD ELSIEBALHASO. Starting with the column ‘1’ (‘G’ in this case), we now read down the whole column, writing out each letter in turn, which results in: Using this table, we can now create our ciphertext. (As we are using Regular Case transposition in this example, any empty cells at the end have been padded with the letter ‘X’.) T Then we simply write the text we wish to encrypt out under it, moving to a new line once we reach the end of each row. In the next row, each letter is given a number that dictates its alphabetical position in the keyword: since ‘G’ is the first letter of the alphabet that is present in the keyword, it gets designated ‘1’ ‘I’ is given ‘2’ as it appears next and so on. To encrypt the text, we write each letter of the keyword at the top of a column. For this example, we’ll be using the keyword of ‘Turing’, which will define how many columns we’ll use to encrypt the message: since the keyword has six letters in it, we’ll be using six columns. Working with columnsĪs with every cipher, you first need to define a key. Right away, we can see that this looks vastly different to the previous result: if you saw these two pieces of ciphertext next to each other, you’d initially have no way of knowing that they contained an identical message. OETNAEEYTEEX ASOTHTSNRNOE NERAEWETEEBX CYHSAUNEETTN WNADCDCPTHDD ELSIEBALHASO If we take the same phrase as above and run it through a columnar transposition cipher, the ciphertext would read: This post will focus on a columnar transposition cipher – a slightly more advanced transposition cipher that produces very different results. ![]()
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