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Readme.md
ciphertext
dceasar.conf
dceasar.py
dceasar_as.sh
freq_an.py

Readme.md

#Cryptanalysis of Ceasar Cipher

  • This program allows to decrypt a text encrypted according to the Ceaser Cipher;
  • The program dceaser.py can decrypt a message in a given shift, the program freq_an.py calcule the probable shift, and the bash wrapper allows to try all the possible shifts;
  • To decrypt a cipher text encrypted according to the Ceaser Cipher without knowing the shift value, you have to:
    • Remove the sharp from the beginning of the line corresponding to the language in which the text was written (default: french);
    • Start the following commands: chmod u+x dceaser_wrapper.sh && ./dceaser_ac.sh [cipherfile].