How to use: SIGABA
SIGABA is a free online Cryptography Tools tool that encipher/decipher with the WW2 SIGABA machine. SIGABA, otherwise known as ECM Mark II, was used by the United States for message encryption during WW2 up to the 1950s. It was developed in the 1930s by the US Army and Navy, and has up to thi instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
Description
Encipher/decipher with the WW2 SIGABA machine. SIGABA, otherwise known as ECM Mark II, was used by the United States for message encryption during WW2 up to the 1950s. It was developed in the 1930s by the US Army and Navy, and has up to thi
- Cryptography Tools
- Because everything is computed client-side, SIGABA is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using SIGABA takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Run
Use cases
Common situations where SIGABA helps:
- Encipher/decipher with the WW2 SIGABA machine. SIGABA, otherwise known as ECM Mark II, was used by the United States for message encryption during WW2 up to the 1950s. It was developed in the 1930s by the US Army and Navy, and has up to thi
Parameters
This tool has no options — it works on the input alone.
FAQ
What is SIGABA?
SIGABA encipher/decipher with the WW2 SIGABA machine. SIGABA, otherwise known as ECM Mark II, was used by the United States for message encryption during WW2 up to the 1950s. It was developed in the 1930s by the US Army and Navy, and has up to thi. It runs entirely in your browser, so your data stays private.
Is SIGABA free to use?
Yes. SIGABA is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.
Good to know
- Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.
- The worked example below could not be pre-computed for this tool (threw: function is not iterable (cannot read property Symbol(Symbol.iterator))); the interactive tool above still works normally.