How to make a simple public-key cryptographic algorithm? https://stackoverflow.com/questions/19017419/how-to-make-a-simple-public-key-cryptographic-algorithm

PublicKeyEncryptionExample.py

import base64
import random as r

MAX_VALUE = 256 * 9

private_key = int(r.random() * MAX_VALUE)
public_key = MAX_VALUE - private_key
shared_key = MAX_VALUE

print("Public Key: %d" % public_key)
print("Private Key: %d" % private_key)
print("Shared Key: %d" % shared_key)

original_text = "Salam, World - سلام يا عالم"

print("Original: %s" % original_text)

################ Encrypted ################

buffer = []

for c in list(original_text):
	buffer.append(chr((ord(c) + public_key) % shared_key))

encrypted = "".join(map(str, buffer));
encoded = base64.urlsafe_b64encode(encrypted.encode("utf-8"))
print("Encrypted: %s" % encoded)

################ Decrypted ################

buffer = []

decoded = base64.urlsafe_b64decode(encoded)
encrypted = decoded.decode("utf-8")

for c in list(encrypted):
	buffer.append(chr((ord(c) + private_key) % shared_key))

decrypted = "".join(map(str, buffer));
print("Decrypted: %s" % decrypted)