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Word Desubstitution

Tool to find a word encrypted with a simple substitution. A word substituted by mono alphabetic cipher can be unsubstituted with a dictionary search (desubstitution).

De-substitution of a word


Answers to Questions

How to de-substitute a word ciphered by mono-alphabetical substitution?

Unsubstitution consists of looking at the distribution of letters in the encrypted word, specifically the repeated and distinct letters in order to make a fingerprint.

Example: XYX is decomposed: one letter, then a second letter distinct from the first one, then the first letter again

With a fingerprint (idiomorph), it is possible to search in a dictionary for words with the same fingerprint and thus corresponding to a mono-alphabetic substitution.

Example: BOB, EVE or SMS can fit, but not CAB.

dCode can not find any result if the substitution is not monoalphabetic (ie it uses a unique alphabet, such a deranged alphabet) or if the word is not present in the dictionary.

What are the most favorable cases?

The 'signature' of the word must be specific, for example, include repetitions of letters. Indeed, if there are no repeated letters, then many words can match.

Why limiting to 2 words?

The number of combinations of words is exponential and beyond the computation times exceed the minute. There are faster heuristics but they do not guarantee a result, dCode prefers to guarantee a result rather than not displaying it. To decipher a sentence, the monoalphabetic substitution tool is much faster.

Source code

dCode retains ownership of the source code of the script Word Desubstitution online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. To download the online Word Desubstitution script for offline use on PC, iPhone or Android, ask for price quote on contact page !

Questions / Comments

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Source : https://www.dcode.fr/word-desubstitution