
infobunny, CC BY
Bill Buchanan, Edinburgh Napier University
We have always been been intrigued by keeping secrets and uncovering the secrets of others, whether that’s childhood secret messages, or secrets and codebreaking of national importance. ![]()
With a film, The Imitation Game, reprising the life of Alan Turing and his role in breaking the Nazi’s Enigma cipher of World War II, how does one codebreak, then and now?
It’s all in the cipher
Imagine that Bob and Alice wish to secretly communicate, and Eve, who wishes to listen in. Here “plain text” refers to the original message, and “cipher text” as the coded message.

Bill Buchanan, Author provided
There are two ways of creating the cipher text:
- Having an algorithm (a cipher) that only Bob and Alice know, so that…
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