polysub-cryptanalysis

Examples of applying Kasiski examination and Index of Coincidence along with Frequency analysis to restore cryptographic key of Vigenere encypted ciphertext and decrypt it.

Encrypted File

encrypted/hostiletext.txt

Structure

• kasiski.py               kasiski examination related methods
• ic.py                       Index of coincidence related methods
• freq_analysis.py     frequency analysis related methods
• processing.py        text transformation/processing related methods
• const.py                 constants
• attack.py                actual decryption