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Vernam Cipher (One Time Pad Vigenere)

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 (One Time Pad Vigenere) -

Tag(s) : Poly-Alphabetic Cipher

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Vernam Cipher (One Time Pad Vigenere)

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Vernam (Vigenere) Cipher Decoder






Vernam (Vigenere) 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 Vigenere encryption method but using a key at least as long as the plain text.

Example: 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 cipher, but this introduces a cryptographic weakness in the message.

How to decrypt Vernam cipher?

Decryption is also identical to Vigenere 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 century and Vernam described it in 1917.

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Source code

dCode retains ownership of the source code of the script Vernam Cipher (One Time Pad Vigenere) 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 Vernam Cipher (One Time Pad Vigenere) script for offline use on PC, iPhone or Android, ask for price quote on contact page !

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Source : https://www.dcode.fr/vernam-cipher-vigenere
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