The Red machine: Challenge

• Introduction
• Working
• Genuine messages
• My Simulator
• Cryptanalysis
• Cryptanalysis by Rowlett & Kullback
• Challenges (This page).

RED cipher machine challenge

I created 9 problems related to the RED machine (link).

The first problem is simple. We provide the entire key. The challenge is to create our own simulator of the machine. Of course, you can also use my simulator.

Some of the problems are simplified because we provide part of the key, as in the case of problem number 2. Some problems use the sixes that correspond to vowels, and others correspond to any letters.

In several problems (3, 4, and 5), the beginning of the message is known. For others, we know several Cribs (7, 8, and 9).

The most complex problem is problem 6. We have no clues. Although the message is relatively short (about 1,000 characters), it can be solved with the help of a computer and the Hill Climbing method.