This small script tries to find a enigma setting encrypting known plaintext into known ciphertext.
Brian Neal's Py-Enigma library is used to simulate the enigma. All possible combinations are bruteforced. Note that is unlikely to find a working combination using this strategy if the plaintext and ciphertext are somewhat longer than five characters each.
Example:
$ python3 main.py --plaintext=GITHUB --ciphertext=PYJAMA
This outputs (after a while of searching):
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Solution found! Encrypt GITHUB to PYJAMA
{'ref': 'B', 'plug': 'AB CD EF GL HJ IN KO MP QT RS ', 'rotor': ('I', 'II', 'III'), 'ring': [0, 0, 0], 'display': 'HLR'}
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Known parameters can be passed to reduce the possibilities.
| Option | Value | Example |
|---|---|---|
rotors |
List of rotor to use. At least 3 are needed. | --rotors II IV VI VIII |
reflectors |
List of reflector to use. More details on py-enigma docs. | --reflectors A B |
ring |
String either space separated letters or numbers. Note that if numbers are used, they should be between 1-26 to match historical key sheet data. | --ring 'A B C' or --ring '0 1 2' |
plugboards |
Number of plugboard to guess | --plugboards 2 |
Py-Enigma