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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) : Cryptography

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Bazeries Cipher

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Bazeries Decoder






Also on dCode: Polybius Cipher

Bazeries Encoder






Also on dCode: Polybius 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.

Answers to Questions

How to encrypt using Bazeries cipher

Encryption uses a number N, and two grids of 25 distinct characters. Bazeries suggested generating the second grid with the number N written in letters, but a keyword is OK too.

One wants to crypt DCODE with N = 23, the first grid is generated with the alphabet (without J) and written in columns:

\12345
1AFLQV
2BGMRW
3CHNSX
4DIOTY
5EKPUZ

And the second grid is generated with the keyword TWENTYTHREE (one could have took TWOTHREE)

\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).

One splits 2 then 3 letters: DC then ODE.

The groups are then written backward

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.

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

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

Let the cipher message be DLSLO and use N=23, grid 1 transposed (without key) is :

\12345
1AFLQV
2BGMRW
3CHNSX
4DIOTY
5EKPUZ

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).

Let's split 2 then 3 letters: DL, then SLO.

Groups of letters are written backward

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.

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 ciphered text?

The ciphered message has an index of coincidencehref similar to the language of the plain text.

How to decipher Bazeries without key?

One can crack Bazeries using frequency analysishref, as it is a simple 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.

When Bazeries have been invented ?

Around 1980.

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Source code

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