2. Code- and cipher-breaking have been in operation for centuries. However, cryptanalysis – the art of deciphering encoded messages – took on a new importance during WW2 as British boffins strived to reveal the true meaning of encrypted German military messages. It is believed that code breaking at Bletchley Park helped to end the war at least 2 years earlier than it would have ended. This saved many thousands of lives.

3. Photo: Hut 3 at Bletchley Park, Buckinghamshire in 1942. Here, civilian and service personnel worked together at code-breaking top-secret military communiques between Hitler and his armed forces

4. Can you solve my decimal code? You will need to work as a team in your tutor group as you do not have time to answer every question. Decide who will calculate which letter and get cracking…….

5. 0.4 x 10 = A 0.35 x 100 = D 0.416 x 1000 = X 0.214 x 1000 = E 0.2 x 10 = B 0.72 x 100 = F 0.041 x 1000 = H 0.8 x 10 = K 0.66 x 100 = L 0.052 x 1000 = W 0.31 x N = 31 0.9 x P = 9 0.78 x 100 = O 0.918 x R = 918 0.67 x 100 = S 0.919 x 1000 = T 0.7 x 10 = U 0.86 x 100 = Y 0.01 x 100 = C

6. 266214919141662148610410008 524678214109196721411000214919 72781000919411000214 35214143521467

7. Answer on next slide.........

8. 266214919141662148610410008 BLETCHLEYPARK 524678214109196721411000214919 WASKEPT SECRET 72781000919411000214 FORTHREE 35214143521467 DECADES