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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).

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Word Desubstitution -

Tag(s) : Substitution Cipher

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Word Desubstitution

De-substitution of a word


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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).

Answers to Questions

How to desubstitute 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 fingerprint 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 online 'Word Desubstitution' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for Word Desubstitution download for offline use on PC, tablet, iPhone or Android !

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Questions / Comments

Thanks to your feedback and relevant comments, dCode has developped the best Word Desubstitution tool, so feel free to write! Thank you !


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