In simple words, two successive conversions of ROT13 restore the original text. You can break down the ROT13 by replacing a letter with the 13th letter after it in the English alphabet. One can easily break it down by frequency analysis or just trying out all 25 keys. It's just a particular form of Ceaser cipher. Why is ROT13 not secure?įrom a security perspective, the ROT13 cipher is not secure. That means we can shift from ABC to Z along 25 times. Thus, there are 25 possible keys, each possible shift of alphabet. In English, there is a total of 26 alphabets. How many possible keys exist for a rotation cipher? Therefore, two rotations will bring you back to your original text. However, it substitutes a letter with the 13th letter after it in the alphabet. ROT13 uses the exact mechanism as Caesar cipher. The same function that encrypts the text will also decrypt the text. In the English alphabet, there are 26 characters (13x2). Generally, the ROT13 is preferred over others because 13 is the value for which the encoding and decoding are equivalent. In the elevators, the extrovert looks at the OTHER guy's shoes. If we use the ROT13 application for decoding, then the punchline will be Punchline: Va gur ryringbef, gur rkgebireg ybbxf ng gur BGURE thl'f fubrf. Joke: How can you tell an extrovert from an introvert at NSA? Currently, it's used to hide offensive jokes, puzzle solutions, movies, other story spoilers, and abusive material from readers that find it offensive.įor example, in the following joke, the punchline is hidden using ROT13. In the early 1980s, the ROT13 was used in a net.jokes newsgroup. The pattern continues as N becomes the A, and so on to Z, which becomes M. Here, A becomes N and goes to M, which becomes Z. You can then replace the letters accordingly.įor example ABCDEFGHIJKLM becomes NOPQRSTUVWXYZ Write from A to M on a piece of paper, and below that, write from N to Z. ROT13 decryption is just like ROT13 encryption because of the reciprocal substituting alphabet. Numbers, symbols, whitespace, and all other characters remain unaffected. Note: Only those alphabets that are in English are get affected. Output: NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm Input: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz Thus, in ROT13, every letter is shifted to the 13th letter after it to encrypt or decrypt the text. The sequence continues as N becomes A, O becomes B, and so on up to Z, which becomes M. For example, A becomes N, B becomes O, and so on up to M, which becomes Z. The 13th position in the alphabet shifts each letter. How to encrypt using Rot13?Įncryption with Rot13 substitutes a letter with the 13th letter after it in the English alphabet. That technique substitutes a letter with the 13th letter after it in the alphabet. ROT13 ( rotate by 13 places, sometimes referred to as ROT-13) is a substitution cipher with a shift of 13. The first cipher device was used by Spartans as early as 400 bc for secret communication among their military officials. It converts the plaintext to ciphertext using a key that determines how it's done. About Convert ROT13 to Text What do ciphers do?Ĭiphers are the encoding algorithms used to encode and decode the data.
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