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Vernam Cipher

Tool to decrypt/encrypt with Vernam. Vernam cipher is a particular case of Vigenere cipher where the key is as long as the text, which render useless any cryptanalysis attempt.

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Vernam Cipher -

Tag(s) : Cryptography, Vigenere Variant

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Vernam Cipher

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Vernam Encoder






Tool to decrypt/encrypt with Vernam. Vernam cipher is a particular case of Vigenere cipher where the key is as long as the text, which render useless any cryptanalysis attempt.

Answers to Questions

How to encrypt using Vernam cipher?

It is the same as Vigenerehref encryption method but using a key at least as long as the plain text.

To encrypt DCODE, you need a key of at least 5 letters KEYWORD, PASSWORD, etc.

If the key is not long enough, it will be repeated, as in the Vigenere cipherhref, but this introduces a cryptographic weakness in the message.

How to decrypt Vernam cipher?

Decryption is also identical to Vigenerehref decryption method.

How to recognize Vernam ciphertext?

The Vernam cipher message has an indice of coincidence close to a random text.

How to decipher Vernam without key?

If the key length is as long as the text length, then no cryptanalysis method can crack Vernam.

When Vernam cipher have been invented ?

First example have been found at the end of the 19th centuryhref and Vernam described it in 1917.

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Source code

dCode retains ownership of the source code of the script Vernam Cipher. 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, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the Vernam Cipher script for offline use, for you, your company or association, see you on contact page !

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 Vernam Cipher tool. Thank you.


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