Enigma Machine Simulator
Use a free Enigma machine simulator to encrypt and decrypt text online. Set Enigma I, M3 or M4 rotors, rings, reflector and plugboard; inspect every letter's path.
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Fialka M-125 Simulator
Simulate Fialka M-125 Cyrillic encryption with 10 wheels and a punched card in your browser — free, with no sign-up. Choose the wheel series, starting windows and punched card, then enter your message. Each message starts from this key.
Machine setup
Choose a wheel series, 10 wheels, starting windows and a punched card. Every message starts from this key.
Rotor order (left to right)
1:А · 2:А · 3:А · 4:А · 5:А · 6:А · 7:А · 8:А · 9:А · 10:А
Encrypt or decrypt
Use the same series, wheel order, windows and card to decrypt. The machine accepts the 30 Cyrillic contacts.
0 / 5000
In coding mode, space becomes Й and a literal Й becomes И. Decoding prints an internal Й as a space, so the original Й is lost.
Follow the signal
The signal crosses the card, ten wheels and reflector, then returns. Wheels step after each letter.
Enter text to inspect each letter's path and wheel movement.
This models 30-contact letters mode with fixed cores. Published 3K, 5K, 6K and 68 wheel sets are included; PROTON-2 adjustments, number mode and paper tape are outside this model.
Processing stays in this tab. Messages and key settings are not sent to mtool. Historical ciphers are unsuitable for modern secrets.
Historical wiring and stepping references: Fialka Reference Manual · Crypto Museum
How it works
- Configure 10 wheels and cardChoose a wheel series, 10 wheels, starting windows and a punched card. Every message starts from this key. Selecting a wheel already in use swaps the two IDs. Each wheel appears once.
- Punched cardEnter 30 unique letters in contact order: each input maps to one output. The identity card matches the metal test triangle.
- Encrypt or decryptUse the same series, wheel order, windows and card to decrypt. The machine accepts the 30 Cyrillic contacts. In coding mode, space becomes Й and a literal Й becomes И. Decoding prints an internal Й as a space, so the original Й is lost.
Questions
What is the Fialka M-125?
Simulate the Fialka M-125 online: set 10 wheels and a punched card, encrypt or decrypt Cyrillic text, and inspect every rotor step. Choose a wheel series, 10 wheels, starting windows and a punched card. Every message starts from this key.
How does its punched card work?
Enter 30 unique letters in contact order: each input maps to one output. The identity card matches the metal test triangle.
How do I decrypt Fialka ciphertext?
Use the same series, wheel order, windows and card to decrypt. The machine accepts the 30 Cyrillic contacts. In coding mode, space becomes Й and a literal Й becomes И. Decoding prints an internal Й as a space, so the original Й is lost.
Which Fialka variants does this simulate?
This models 30-contact letters mode with fixed cores. Published 3K, 5K, 6K and 68 wheel sets are included; PROTON-2 adjustments, number mode and paper tape are outside this model.
Is this tool free?
Yes. This tool is free, with no sign-up and no daily limits.
Do I need an account?
No. You can use this tool without an account.
Is my input sent anywhere?
No. This tool runs in your browser. Your input and results never leave your device unless you choose to share them.
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