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Alphabetical Substitution

Tool to decrypt monoalphabetical substitution and find each letter of a substituted message with a deranged alphabet.

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Alphabetical Substitution -

Tag(s) : Cryptography,Substitution Cipher

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Alphabetical Substitution

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Monoalphabetic Substitution Decoder






Monoalphabetic Substitution Encoder




Also on dCode: Caesar Cipher

Tool to decrypt monoalphabetical substitution and find each letter of a substituted message with a deranged alphabet.

Answers to Questions

How to encrypt using an alphabetical substitution?

The (mono)alphabetical substitution consists in using a mixed alphabethref (with the letters in an unusual order) and replace the lettershref of the alphabet normal by it.

NBAJYFOWLZMPXIKUVCDEGRQSTH is a totally random alphabethref with the 26 letters of the Latin alphabet.

We can write the alphabet over the classic alphabet to better understand:

Plain alphabetABCDEFGHIJKLMNOPQRSTUVWXYZ
Substution alphabetNBAJYFOWLZMPXIKUVCDEGRQSTH

The substitution involves replacing the plaintext of all the letters of the first row with the letters associated with the second row.

All A become N, all the B remain B, all the C become A, etc.

With this substitution DCODE is encrypted as JAKJY.

Any deranged alphabethref can be used to create a single alphabetical substitution (the same letter can be used only once in the alphabet).

How to decrypt using an alphabetical substitution?

Decryption requires knowing the alphabet mixed used and the inverse substitution encryption.

Substitution AlphabetNBAJYFOWLZMPXIKUVCDEGRQSTH
Plain AlphabetABCDEFGHIJKLMNOPQRSTUVWXYZ

The substitution involves replacing in the ciphertext all the letters of the first row with the letters associated with the second row.

Consider the encrypted message JAKJY, then the plain message is DCODE.

How to recognize a mono alphabetical substituted text?

The ciphered message has an index of coincidencehref identical to the language of the plain text.

How to decipher a substitution without the alphabet?

The interactive tool provided by dCode allows a semi-automatic decryption of messages ciphered by substitution.

The main technique is to analyze the frequencies of letters and find the most likely bigrams.

The most common alphabets used for substitutions are: AZERTYUIOPQSDFGHJKLMWXCVBN
NBVCXWMLKJHGFDSQPOIUYTREZA
QWERTYUIOPASDFGHJKLZXCVBNM
MNBVCXZLKJHGFDSAPOIUYTREWQ
AQWZSXEDCRFVTGBYHNUJIKOLPM
ZYXWVUTSRQPONMLKJIHGFEDCBA
'AEIOUYBCDFGHJKLMNPQRSTVWXZ

What are the variants of the substitution cipher?

First some substutition use specific alphabets, as Atbashhref that takes the alphabet backwards ZYXWVUTSRQPONMLKJIHGFEDCBA or the Caesar cipherhref which uses a shifted alphabet DEFGHIJKLMNOPQRSTUVWXYZABC that is shifted by 3. Then there are substitutions that use several alphabets, such as alphabet that changes depending on an algorithm defined by encryption (e.g. Vigenerehref uses 26 alphabets).

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Questions / Comments


Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best Alphabetical Substitution tool. Thank you.


Source : http://www.dcode.fr/monoalphabetic-substitution
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