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poly_cipher.py

# PolyalphabeticCipher ## Description PolyalphabeticCipher is a Python tool designed to decrypt text encoded with a polyalphabetic substitution cipher, such as the Caesar cipher. This script takes an input string and attempts to decode it by trying all possible key shifts (1 through 26) and outputs the resulting plaintext for each key. ## Features - **Uniform Processing**: Converts the input text to lowercase for uniform processing. - **Character Mapping**: Utilizes a character mapping based on shifted alphabet positions. - **Handling Non-Alphabetic Characters**: Leaves non-alphabetic characters unchanged. - **Comprehensive Output**: Outputs all possible plaintexts for each key shift, allowing the user to identify the correct key and deciphered text. ## Example ### Input Copier cette commande dans un shell `Grfg zrffntr` ### Output ``` Key 1: fqef yqeemsq Key 2: epde xpdellr Key 3: docd wocdkkq Key 4: cncb vncjjjp Key 5: bmba umbiioo Key 6: alab tlahhnn Key 7: zkza skzggmm Key 8: yjyz rjyffll Key 9: xixy qixeekk Key 10: whwx phdddjj Key 11: vgvw ogcccii Key 12: ufun nfbbbhh Key 13: teto meaaagg Key 14: sdsn ldzzzff Key 15: rcsm kcyyyee Key 16: qbrl jbxxxdd Key 17: paqk iawwwcc Key 18: ozpj hzvvvbb Key 19: nooi gyuuuaa Key 20: mnnn fxtttzz Key 21: lmmm ewsssyy Key 22: klll dvrrrxx Key 23: jkkk cuqqqww Key 24: ijjj btpppvv Key 25: hiii asooouu Key 26: ghhh zrnnttt ``` shell Copier le code ## Usage ### Prerequisites - Python 3.x ### Installation 1. Clone the repository: ```bash git clone https://github.com/albert3661/PolyalphabeticCipher.git Navigate to the project directory: bash Copier le code `cd PolyalphabeticCipher` Running the Script Run the script with the encrypted text as input: bash Copier le code `python polyalphabetic_cipher.py "Grfg zrffntr"` Review the output and identify the correct plaintext. License This project is licensed under the MIT License. See the LICENSE file for details.

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