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Arnold Cipher

Tool to decrypt / encode like Arnold. Arnold's cipher is a book cipher using either William Blackstone's Commentaries on the Laws of England or Nathan Bailey's Dictionary.

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Arnold Cipher -

Tag(s) : Cryptography, Substitution Cipher

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Arnold Cipher

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Arnold Cipher

The encryption used by John André and Benedict Arnold is called a Book Cipher. This type of encryption uses the disposition of words in a book (chapter, page, line). Thus, to achieve exactly the encryption/decryption of Arnold we must have the same version of the book he used: Commentaries on the Laws of England by William Blackstone or the Nathan Bailey dictionary. dCode does not have such numerized books.

Tool to decrypt / encode like Arnold. Arnold's cipher is a book cipher using either William Blackstone's Commentaries on the Laws of England or Nathan Bailey's Dictionary.

Answers to Questions

How to encrypt using Arnold cipher?

Encryption requires a book (physical or scanned) with numbered pages.

In order to encrypt a word, it must be located among the pages of the book (which implies that the book is large enough and / or contains a maximum of words).

Each word is encoded by a triplet of numbers: a page number, a line number on that page and a word number on that line.

Example: 3,2,1 for the 1st word of the 2nd line of the 3rd page.

How to decrypt Arnold cipher?

Decryption requires knowing / possessing the book used during encryption. It is essential that it is the same book (or the same edition, with the same layout).

For each triplet (X, Y, Z), the decryptor must open the book on page X, count line Y on the page, and note the word number Z on the line.

How to recognize a Arnold ciphertext?

Arnold's number is made of triplets of non-zero integers.

What are the variants of the Arnold cipher?

Arnold's book cipher use triplets (page, line, word). It can be simplified in (page, word) or even just (word) or complicated in (chapter, page, line, word).

It is also possible to extract not the word, but a single letter (page, line, word, letter).

When Arnold have been invented ?

Arnold described this cipher in 1779 but it had certainly been used before.

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Source code

dCode retains ownership of the source code of the script Arnold Cipher 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. So if you need to download the online Arnold Cipher script for offline use, check contact page !

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