import binascii

n = 9516311845790656153499716760847001433441357    # p*q = modulus
e = 65537
d = 5617843187844953170308463622230283376298685

message='Rosetta Code!'
print('message                 ', message)

hex_data   = binascii.hexlify(message.encode())
print('hex data                ', hex_data)

plain_text = int(hex_data, 16)
print('plain text integer      ', plain_text)

if plain_text > n:
  raise Exception('plain text too large for key')

encrypted_text = pow(plain_text,     e, n)
print('encrypted text integer  ', encrypted_text)

decrypted_text = pow(encrypted_text, d, n)
print('decrypted text integer  ', decrypted_text)

print('message                 ', binascii.unhexlify(hex(decrypted_text)[2:]).decode())     # [2:] slicing, to strip the 0x part