Encrypted Message Board using 4x4 Hill Cipher

Encrypted Message Board implemented using Hill Cipher Encryption algorithm which uses 4x4 key matrix.

Constraints

• Does not support numbers, special characters.
• Key matrix should be invertible modulo 26.

Tech Stack used

• python
• flask
• flask-socketio
• jquery
• bootstrap

Usage

1. pip3 install flask flask-socketio
2. python3 main.py

Key Matrix

An example for 4x4 key matrix is:

8  6 9  5
6  9 5  10
5  8 4  9
10 6 11 4

Required condition: Key matrix should be invertible modulo 26.

Screenshots

• Encrypted messages

  

• Decrypted messages