Signals intelligence in modern history

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Before the development of radar and other electronics techniques, signals intelligence and communications intelligence were essentially synonymous. Sir Francis Walsingham ran a postal interception bur

HMS Diana carried out one of the first signals interceptions in 1904, when it picked up the order for the mobilization of the Russian fleet at the beginning of the Russo-Japanese War.

The Admiralty Ripley building. Room 40 succeeded in intercepting and decrypting German naval signals.

SMS Magdeburg ran aground off Odensholm and provided Room 40 with the German SKM codebook.

Captain H.J. Round devised and oversaw the construction of an array of direction finding stations that were able to track the movements of enemy ships.

Bletchley Park

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Bletchley Park is an English country house and estate in Bletchley, Milton Keynes, that became the principal centre of Allied code-breaking during the Second World War. During World War II, the estate

Signals intelligence in modern history

…cryptanalysis for the whole of the British forces in World War II came under the code name "Ultra" managed from Government Code and Cypher School at Bletchley Park. By 1943, such was the extent of penetration of Axis communications and the speed and efficiency of distribution of the resulting intelligence, messages…

The mansion in 2017

Bletchley's Polish Memorial, commemorating "the [prewar] work of Marian Rejewski, Jerzy Różycki and Henryk Zygalski, mathematicians of the Polish intelligence service, in first breaking the Enigma code. Their work greatly assisted the Bletchley Park code breakers and contributed to the Allied victory in World War II."

Stephen Kettle's 2007 Alan Turing statue

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