PGP Example (using static values)

crypt.py

def crypt(mod, key, data, hashes = 50):
  encrypted = []
  for v in data:
    for i in range(0, hashes + 1):
      v = (v ** key) % mod
    encrypted.append(v)
  return list(map(int, encrypted))
    
# My keys (p and q are intermediates)
p = 11
q = 43
my_mod = p*q
my_public = 23
my_private = 1187
p, q = None, None

# Your keys
p2 = 97
q2 = 89
you_mod = p2*q2
you_public = 17
you_private = 497
p2, q2 = None, None

# (you)'s super secret message
message = input("Your secret message: ")
# Now represented as their indexies on the ASCII table
data = list(map(ord, str(message)))
# Now (you) is going to send the message
# first they encrypt the message with my public key
encrypted = crypt(my_mod, my_public, data)
# then (you) sign it, so I know it came from (you)
# and not someone else that has my public key
signed = crypt(you_mod, you_private, encrypted)

print("\n")
print("=== YOU (SENDER) ===")
print("message     =", message)
print("data        =", data)
print("encrypted   =", encrypted)
print("signed      =", signed)
print("")

# Then you send me signed.
# Now I unsign it, by crypting it with your pub
unsign = crypt(you_mod, you_public, signed)
# Now I decrypt it by using my private key
msg2 = crypt(my_mod, my_private, unsign)

print("====== RECIVER =====")
print("signed      =", signed)
print("unsigned    =", unsign)
print("unencrypted =", msg2)
print("message     =", ''.join(list(map(chr, msg2))))

refrence: http://www.dongrays.com/btd/crypt-how.html