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.

Bazeries Cipher - dCode

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

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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.

**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 written in letters, but any keyword is fine too.

Example: To crypt DCODE with N=23, use a first grid, generated with the alphabet (without J) and written in columns:

\ | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|

1 | A | F | L | Q | V |

2 | B | G | M | R | W |

3 | C | H | N | S | X |

4 | D | I | O | T | Y |

5 | E | K | P | U | Z |

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

\ | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|

1 | T | W | E | N | Y |

2 | H | R | A | B | C |

3 | D | F | G | I | K |

4 | L | M | O | P | Q |

5 | S | U | V | X | Z |

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.

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.

Example: C (line 3, column 1, grid 1) is replaced by D (line 3, column 1, grid 1) and so on.

Example: The final **Bazeries** ciphered message is DLSLO

**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 :

\ | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|

1 | A | F | L | Q | V |

2 | B | G | M | R | W |

3 | C | H | N | S | X |

4 | D | I | O | T | Y |

5 | E | K | P | U | Z |

\ | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|

1 | T | W | E | N | Y |

2 | H | R | A | B | C |

3 | D | F | G | I | K |

4 | L | M | O | P | Q |

5 | S | U | V | X | Z |

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.

Example: The original plain text is DCODE.

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

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.

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

**Bazeries** is already considered a variant of the Polybius cipher.

Etienne **Bazeries** would have created this cipher near 1980.

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bazeries,etienne,grid,key,polybius

Source : https://www.dcode.fr/bazeries-cipher

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