Decrypting a message

By Kevin McAleer,    2 Minutes

Decrypting a message

To decrypt a message using Py-Engima, you first need to create an Enigma machine. You can do this by creating an instance of the EnigmaMachine class and passing in the rotor settings and plugboard settings. Here’s an example:

from enigma.machine import EnigmaMachine

machine = EnigmaMachine.from_key_sheet(
   rotors='II V III',
   reflector='B',
   ring_settings='1 1 1',
   plugboard_settings='AV BS CG DL FU HZ IN KM OW RX',
   )

# Set the initial position of the Enigma rotors
machine.set_display('QJF')

ciphertext = 'FKFPQZYVON'

plaintext = machine.process_text(ciphertext)
print(plaintext)

In this example, we create an instance of the EnigmaMachine class and pass in the rotor settings, reflector settings, ring settings, and plugboard settings. We then set the initial position of the rotors and use the process_text method to decrypt the message. The decrypted message is then printed to the console.

You can use the process_text method to decrypt any message that has been encrypted using the Enigma machine. You just need to create an instance of the EnigmaMachine class with the same rotor settings, reflector settings, ring settings, and plugboard settings that were used to encrypt the message. You also need to set the initial position of the rotors to the same position that they were in when the message was encrypted. Once you have done this, you can use the process_text method to decrypt the message.