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SIGSALY: Churchill's wartime secure line to Roosevelt

Original: SIGSALY: Churchill's top secret hotline to the president

A history piece revisits SIGSALY, the pioneering encrypted telephone system used during the Second World War to connect British Prime Minister Winston Churchill with US President Franklin D. Roosevelt. The system scrambled voice transmissions so Allied leaders could hold secret conversations across the Atlantic without interception, laying groundwork for modern digital secure communications.

Why now: Interest in wartime communications history and the origins of encryption technology

Winston ChurchillFranklin D. RooseveltSIGSALYImperial War Museums

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• Sigsaly: Churchill's top secret hotline to the President · stmw · 128

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