EjafaProtocol Python Implementation

This is a Python implementation of the EjafaProtocol, a secure communication protocol that uses:

• X25519 for key exchange
• BLAKE2b for key derivation
• XChaCha20-Poly1305 for authenticated encryption

Installation

1. Clone this repository:

git clone https://github.com/yourusername/EjafaProtocol.git
cd EjafaProtocol

2. Install dependencies:

pip install -r requirements.txt

Usage

Run the example implementation:

python ejafa.py

Implementation Details

The EjafaProtocol Python implementation provides:

1. Secure Key Exchange: Using X25519 for Diffie-Hellman key exchange
2. Key Derivation: Using BLAKE2b for deriving session keys
3. Authenticated Encryption: Using XChaCha20-Poly1305 for secure message encryption

API

# Create protocol instances
alice = EjafaProtocol("Alice", alice_private_key, alice_public_key)
bob = EjafaProtocol("Bob", bob_private_key, bob_public_key)

# Perform key exchange
shared_secret = alice.perform_key_exchange(bob_public_key)

# Derive session key
key = alice.derive_key(shared_secret)

# Encrypt message
ciphertext, nonce = alice.encrypt(plaintext, key)

# Decrypt message
plaintext = bob.decrypt(ciphertext, key, nonce)

Security Notes

• This implementation uses cryptographic primitives from the cryptography and PyNaCl libraries
• The protocol uses 32-byte keys and 24-byte nonces for XChaCha20-Poly1305
• Key derivation uses 20 rounds of BLAKE2b hashing