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Mary Stuart Code

Tool to decrypt/encrypt according to Mary, Queen of Scots. Mary Stuart code is a substitution cryptogram by symbols extended to the words used by the Queen of Scots.

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Mary Stuart Code -

Tag(s) : Symbol Substitution

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NB: for encrypted messages, test our automatic cipher identifier!


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Mary Stuart Code

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Mary Queen of Scots Decoder

(Babington Plot Version)

Mary Queen of Scots Encoder

(Babington Plot Version)



Answers to Questions (FAQ)

How to encrypt using Mary Stuart cipher?

The encryption imagined by Mary Stuart uses a correspondence between letters (but also words) and symbols. The complete alphabet is regularly changed but kept secret between her and its correspondents.

Example: an alphabet found is visible in the UK National Archives mary-alphabet-uk-archive

The best known of the alphabets is the one used during the Babington plot, led by Sir Anthony Babington, which aimed to kill Queen Elizabeth I so that Mary Queen of Scots could take the throne. An intercepted message used this alphabet (these are the characters that are the most common on the Internet): alphabet

Example: MARY is coded char(77)char(65)char(82)char(89)

The alphabet contains 5 blank characters that can be used as space or word separator (this makes the frequency analysis more complex).

How to decrypt Mary Stuart cipher?

Mary Stuart decryption is a simple correspondence between used symbols and letters (or words) in plain text according to the alphabet described above.

Example: char(81)char(85)char(69)char(69)char(78) is translated to QUEEN.

Who was Mary Queen of Scots?

Mary Stuart (or Mary I of Scotland) was born December 8, 1542 (and died February 8, 1587) was the Queen of Scotland from 1542 to 1567 and Queen consort of France between 1559 and 1560.

She was convicted of conspiring to assassinate the Queen of England during the Babington plot.

A book is dedicated to her and her code here (link)

Source code

dCode retains ownership of the online "Mary Stuart Code" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "Mary Stuart Code" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "Mary Stuart Code" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "Mary Stuart Code" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Mary Stuart Code' tool, so feel free to write! Thank you!


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