Veteran Code-breakers Show How They Broke Hitler's Wartime Codes

BLETCHLEY, ENGLAND - JUNE 03: Former "Wren" and Colossus operator at Bletchley Park, Lorna Cockayne inspects a slip of undulator tape used in codebreaking during World War II at The National Museum of Computing on June 3, 2016 in Bletchley, England. During World War II British codebreakers helped decypher the German Army's Lorenz cypher using the Colossus computer and Tunny machine at the Government Code and Cypher School's (GC&CS) main codebreaking centre, Bletchley Park. The machines at Bletchley Park's Block H, the world's first purpose-built computer centre, helped gather crucial intelligence for the British military during the war. (Photo by Jack Taylor/Getty Images)