caesar-cipher-tool/ │ ├── main.py # Entry point — interactive CLI menu │ ├── modules/ │ ├── __init__.py │ ├── cipher.py # Core encrypt/decrypt logic │ ├── cracker.py # Brute force & frequency analysis ...

This project implements the classical Playfair cipher, a manual symmetric encryption technique based on digraph substitution. The program generates a 5×5 key matrix from a user-provided key (with the ...

Abstract: In everyday life, it is crucial to protect our data and communication. The necessity for secure message communication is not a novel concept. It has existed for a long time. Data security ...

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