Vigenere

This is the first assignment for my security system's class, which aims to break vigenere cipher by cryptanalysis

Problem

Given a text encrypted with vigenere cipher, find the corresponding plain text

Constraints

• The index of coincidence value is assumed as 0.072723 (portuguese)
• The cryptanalysis is made over portuguese texts only

Run

python Vigenere.py <file_name.ext>