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Bazeries Cipher

Tool to decrypt/encrypt Bazeries automatically. The Bazeries Cipher is a ciphering system created by Etienne Bazeries combining two grids (Polybius), and one key creating super-encryption.

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Bazeries Cipher -

Tag(s) : Substitution Cipher, Poly-Alphabetic Cipher

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Bazeries Cipher

Bazeries Decoder





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See also: Polybius Cipher

Bazeries Encoder





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See also: Polybius Cipher

Answers to Questions (FAQ)

How to encrypt using Bazeries cipher

Bazeries encryption uses a number N, and two identical grids (usually square grids of 25 distinct characters). Bazeries suggested generating the second grid from the number N, number written in letters, but any keyword is fine too.

Example: To crypt DCODE with N=23, use a first grid, generated with the alphabet (one letter should be removed) and written in columns and the second grid generated with the keyword TWENTYTHREE (one could have took TWOTHREE)

Grid 1Grid 2
\12345
1AFLQV
2BGMRW
3CHNSX
4DIOTY
5EKPUZ
\12345
1TWENY
2HRABC
3DFGIK
4LMOPQ
5SUVXZ

The message is segmented by groups of letters with cardinality equals to each digit of N (repeated if necessary).

Example: The number 23 is made of the digits 2 and 3, so split in 2 then 3 letters: DC then ODE.

If the groups of letters are larger than 10, indicate the successive sizes, separating them with commas if necessary.

The groups are then written backward

Example: DC becomes CD and ODE becomes EDO

The letters are located in the grid 1 and replaced by the letter in the same position in grid 2. The encrypted message is the result obtained.

Example: C (line 3, column 1, grid 1) is replaced by D (line 3, column 1, grid 1) and so on. The final Bazeries ciphered message is DLSLO.

How to decrypt Bazeries cipher

Bazeries decryption requires a number N and two grids (or the keys to generate them).

Example: The cipher message is DLSLO, the number N=23, grid 1 transposed (without key) is:

\12345
1AFLQV
2BGMRW
3CHNSX
4DIOTY
5EKPUZ
and grid 2 (key: TWENTYTHREE created from N) :
\12345
1TWENY
2HRABC
3DFGIK
4LMOPQ
5SUVXZ

The message is segmented by groups of letters with cardinality equals to each digit of N (repeated if necessary).

Example: 23 is made of the digits 2 and 3, let's split the message by 2 then 3 letters: DL and SLO.

Groups of letters are written backward

Example: DL becomes LD and SLO becomes OLS

Each letter is located in the second grid, and replaced by the letter with the same coordinate in the first grid.

Example: L (line 4, column 1, grid 2) is replaced by D (line 4, column 1, grid 1) and so on. The original plain text is DCODE.

How to recognize a Bazeries ciphertext?

A Bazeries ciphered message has an index of coincidence close to the language of the plain text.

The presence of a number (usually at least 2 digits) is a clue.

How to decipher Bazeries without key?

One can crack Bazeries using frequency analysis, as it is a substitution, but a manual analysis is then needed to find the key used and reverse segments of the message.

What are the variants of the Bazeries cipher?

Grids can be written in rows or in columns, they also can be switched.

Bazeries is already considered a variant of the Polybius cipher.

When Bazeries have been invented?

Etienne Bazeries would have created this cipher near 1980.

Source code

dCode retains ownership of the online 'Bazeries Cipher' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Bazeries Cipher' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Bazeries Cipher' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Bazeries Cipher' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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 'Bazeries Cipher' tool, so feel free to write! Thank you!


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