6. Pretty Good Privacy (PGP).ipynb

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    "# Pretty Good Privacy (PGP)\n",
    "\n",
    " - A data encryption/decryption tool\n",
    " - Can be used to encrypt and authenticat email, files, etc.\n",
    " - Created by Phil Zimmermann in 1991\n",
    " - A practical hybrid system that uses symmetric and asymmetric crypto\n",
    "\n",
    "<img src=\"include/PGP_diagram.png\" width=700>\n",
    "\n",
    "image source: wikipedia"
   ]
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    "def enc_key(public_key, message):\n",
    "    pass\n",
    "\n",
    "def dec_key(private_key, ciphertext):\n",
    "    pass\n",
    "\n",
    "def enc_msg(key, iv, msg):\n",
    "    pass\n",
    "\n",
    "def dec_msg(key, iv, ciphertext):\n",
    "    pass\n",
    "\n",
    "def gen_hmac(key, msg):\n",
    "    pass\n",
    "\n",
    "def verify_hmac(key, msg, sig):\n",
    "    pass"
   ]
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    "k1 = os.urandom(16)\n",
    "k2 = os.urandom(16)\n",
    "iv = os.urandom(16)\n",
    "msg = b\"PyCon2017 Crypto\"\n",
    "\n",
    "cipher = enc_msg(k1, iv, msg)\n",
    "sig = gen_hmac(k2, msg)\n",
    "encrypted_key = enc_key(public_key, k1)\n",
    "\n",
    "decrypted_key = dec_key(private_key, encrypted_key)\n",
    "plaintext = dec_msg(decrypted_key, iv, cipher)\n",
    "verify_hmac(k2, plaintext, sig)"
   ]
  }
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