Project Enigma – GCHQ Code making competition | Blue Peter
Ritchie explains what GCHQ does for the UK and how to create a hidden code in a poster for Blue Peter's Enigma competition.Tweet
Project Enigma - Cracking codes in London | Blue Peter
The competition winners use a replica working Enigma machine to crack their own puzzle set by GCHQ.
Project Enigma - GCHQ Tour and challenge | Blue Peter
The competition winners, get their first look inside GCHQ and are given their top-secret mission to crack.