![]() The transformation can be done using a lookup table, such as the following:ĪBCDEFGHIJKLM NOPQRSTUVWXYZ abcdefghijklm nopqrstuvwxyz ![]() In other words, two successive applications of ROT13 restore the original text (in mathematics, this is sometimes called an involution in cryptography, a reciprocal cipher). Because there are 26 letters in the English alphabet and 26 = 2 × 13, the ROT13 function is its own inverse: ROT 13 ( ROT 13 ( x ) ) = x for any basic Latin-alphabet text x. Only those letters which occur in the English alphabet are affected numbers, symbols, punctuation, whitespace, and all other characters are left unchanged. A becomes N, B becomes O, and so on up to M, which becomes Z, then the sequence continues at the beginning of the alphabet: N becomes A, O becomes B, and so on to Z, which becomes M. ROT13 has inspired a variety of letter and word games online, and is frequently mentioned in newsgroup conversations.Īpplying ROT13 to a piece of text merely requires examining its alphabetic characters and replacing each one by the letter 13 places further along in the alphabet, wrapping back to the beginning if necessary. ROT13 is used in online forums as a means of hiding spoilers, punchlines, puzzle solutions, and offensive materials from the casual glance. The algorithm provides virtually no cryptographic security, and is often cited as a canonical example of weak encryption. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome.īecause there are 26 letters (2×13) in the basic Latin alphabet, ROT13 is its own inverse that is, to undo ROT13, the same algorithm is applied, so the same action can be used for encoding and decoding. txt file is free by clicking on the export iconĬite as source (bibliography): Letter Number Code (A1Z26) A=1, B=2, C=3 on dCode.ROT13 (" rotate by 13 places", sometimes hyphenated ROT-13) is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the latin alphabet. The copy-paste of the page "Letter Number Code (A1Z26) A=1, B=2, C=3" or any of its results, is allowed (even for commercial purposes) as long as you cite dCode!Įxporting results as a. Except explicit open source licence (indicated Creative Commons / free), the "Letter Number Code (A1Z26) A=1, B=2, C=3" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Letter Number Code (A1Z26) A=1, B=2, C=3" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Letter Number Code (A1Z26) A=1, B=2, C=3" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app! Ask a new question Source codeĭCode retains ownership of the "Letter Number Code (A1Z26) A=1, B=2, C=3" source code. Use of modulo 26 in order to get 1=A,2=B,…26=Z then 27=A, 28=B etc. ![]() Use of a custom alphabet, or reversed alphabet (A=26, Z=1) Use of leading zeros to be able to concatenate numbers AB = 0102, else AB = 12 and 12 = L. Use of a supplementary character for space (usually 0 or 27) Shift of numbers: the alphabet can start with A = 0 or A = 1, but also A = 65 or A = 97 ( ASCII code).
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