very simple RSA example using the pycrypto module

gistfile1.txt

'''

pip install pycrypto

'''


from Crypto.PublicKey import RSA
from Crypto import Random
import ast

random_generator = Random.new().read
key = RSA.generate(2048, random_generator)  # generate pub and priv key

publickey = key.publickey()  # pub key export for exchange

encrypted = publickey.encrypt('encrypt this message', 32)
# message to encrypt is in the above line 'encrypt this message'

print ('encrypted message:', encrypted)  # ciphertext
f = open('encryption.txt', 'w')
f.write(str(encrypted))  # write ciphertext to file
f.close()

# decrypted code below

f = open('encryption.txt', 'r')
message = f.read()

decrypted = key.decrypt(ast.literal_eval(str(encrypted)))

print ('decrypted', decrypted)

f = open('encryption.txt', 'w')
f.write(str(message))
f.write(str(decrypted))
f.close()