Implementing-cryptography-using-python

Chapter 8 ■ Cryptographic Applications and PKI 229
print ("\nDecrypting message with your personal private key ",
private ," . . .")
print ("\nYour message is: {}\n\n".format(decrypt(private,
encrypted_msg)))
To produce the output in Figure 8.1, enter 11 as your first prime and 17 as
your second.
Figure 8.1: Understanding RSA
Generating RSA Certificates
For our next example, we will utilize the PyCrypto library and import the RSA
module. In the next code listing, you will generate a new RSA key and then
export the private and public aspects of the key into variables that are then
saved as certificates to disk. The keys here are much larger than used in the
previous example, which makes them much harder to crack. You may notice
that this program is also much slower due to the increased time it takes to find
the coprime key pair as the key size increases:
#ch8_Generate_RSA_Certs.py
from Crypto.PublicKey import RSA
#Generate a public/private key pair using 4096 bits key length (512
bytes)
new_key = RSA.generate(4096, e=65537)
#The private key in PEM format
private_key = new_key.exportKey("PEM")