Lorenz ciphers and the Colossus

by Tony Sale

Tony Sale's
Codes and Ciphers

The Lorenz cipher machine and the Colossus

This area of the site has three extensive pages by Tony Sale:

1. Introducing the Lorenz cipher machine, and how Bletchley Park broke it.

2. The proposal for high-speed machine codebreaking methods, leading to the Heath Robinson and the Colossus.

3. The rebirth of the Colossus as described by its rebuilder.

4. The slow evolution from a Mk 1 to a Mk 2 Colossus.

Now you can also read about the rebuild of Heath Robinson.


You can also use an interactive Virtual Colossus.
You will need to print this PDF file of instructions before you run it.




This page was originally created by the late Tony Sale
the original curator of the Bletchley Park Museum and is currently being hosted by Rich Sale Limited.