NSA / Cyber & technology · History
Churchill’s Secret Telephone Ran on Records That Operators Destroyed
SIGSALY turned encrypted speech into a vast operation of turntables, couriers and technicians.
SPY REGISTER / THE ARCHIVE
The Archive
Operations, double lives, stolen secrets and the people behind them.
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United Kingdom / Spy games · History
Operation Mincemeat gave a dead man an invented life to carry false invasion plans
British intelligence planted a fictitious Royal Marine officer off Spain in 1943, using personal papers and a briefcase to direct German attention away from Sicily.
The reused code pages that opened Moscow’s secrets
VENONA grew from a small Army project into a decades-long intelligence partnership. Its surviving messages also show the limits of reading an enemy’s traffic.
MI5 / Spy games · History
Eddie Chapman’s fake aircraft-factory attack built his cover as Agent Zigzag
A safecracker sent to sabotage Britain surrendered after landing in December 1942; MI5 used a staged factory bombing to convince his German handlers he had succeeded.
NSA / Spy games · History
A Fake Water Shortage Helped Nimitz Set Japan’s Midway Trap
American codebreakers planted a lie where Japanese intelligence could find it.
MI5 / Spy games · History
MI5’s Fake Gestapo Office Collected the Secrets Meant for Hitler
Eric Roberts used a forged German identity card and a bugged London flat to receive military information from British Nazi sympathisers.
FBI / Spy games · History
The FBI’s Fake Office Put Nazi Spies on Film
Germany sent William Sebold to New York as an agent. His handlers’ messages and his visitors were soon passing through an FBI trap.
GCHQ / Cyber & technology · History
A German Operator Repeated a Message. Britain Rebuilt His Secret Cipher Machine.
One breach of procedure gave Bletchley Park an opening into the communications of the German High Command.
NSA / Spy life · History
Six Messages Gave Genevieve Grotjan a Way Into Japan’s Secret Code
Her discovery opened PURPLE. Her next breakthrough helped unlock KGB traffic.
GCHQ / Spy life · History
Joan Clarke: the codebreaker the payroll called a linguist
The Hut 8 specialist helped attack naval Enigma, became a wartime deputy and continued her intelligence career at GCHQ.
GCHQ / Spy life · History
Britain’s Enigma Expert Threw a Tantrum When Poland Showed Him the Answer
The July 1939 meeting outside Warsaw exposed how far Polish codebreakers had advanced—and helped turn Britain toward the methods Enigma required.
NSA / Power & scandal · History
Herbert Yardley Turned America’s Codebreaking Secrets Into a Bestseller
Washington closed his bureau. Its former chief put the operation into print.
MI5 / Spy life · History
Mata Hari Demanded a Million Francs to Spy for France
French intelligence offered a mission to a woman already watched by Britain. The surviving account describes an extravagant price and an ineffective amateur.
GCHQ / Cyber & technology · History
Germany Offered Mexico Three American States. British Codebreakers Read the Offer.
The Zimmermann Telegram became a diplomatic weapon in 1917. London first had to hide how it had acquired it.
MI5 / Spy games · History
A Tailor’s Ticket Unmasked Germany’s Spy in Britain
Carl Hans Lody travelled with an American passport. British censors read his messages, and a label in his jacket exposed his real identity.