Pablito2020/diffie-hellman

Diffie Hellman with OpenSSL and python

Diffie Hellman Key Exchange with OpenSSL 🔑

Summary

• Set Up
• Files
• Create your public and private key
• Cipher a message with the session key
• Decipher a message with the session key
• Running the tests

Set up 📦

Create and enable a virtual environment

    $ pip install virtualenv
    $ python -m venv venv
    $ source venv/bin/activate

Install the dependencies

    $ pip install -r requirements.txt

Files 📁

The assignment specifies that the following files must be submitted:

• pubB.asc (it's inside data/pubB.asc)
• ciphertext.b64 (it's inside data/ciphertext.b64)

Create your public and private key 🔑

For generating a public and private key, execute the following command:

    $ python create_keys.py

The public key will be saved on public_key.asc, and the private key will be saved on private_key.asc

Cipher a message using the session key 🔒

The session key is generated from:

• Your private key (which in the cryptography library needs your public key for recreating the DHPrivateKey object).
• The other entity public key.

Knowing this, execute:

    $ python cipher.py

Decipher the message using the session key 🔓

The session key is generated from:

• Your private key (which in the cryptography library needs your public key for recreating the DHPrivateKey object).
• The other entity public key.

Knowing this, execute:

    $ python decipher.py

Running the tests 🧪

I've made one test that does the following:

• Generates private and public keys for A
• Generates private and public keys for B
• Ciphers a message from A and saves it to a file.
• B deciphers the message from A.
• Assert that the message is the same.

For running this test execute:

    $ ./test/run.sh