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Inter-War |
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The success of Signals Intelligence in World War I led to the creation of a peacetime unit called the Government Code and Cypher School (GC&CS). Initially, the GC&CS comprised 25 cryptologists and 30 support staff. It studied the methods of cipher communication used by foreign powers - and advised on the security of British ciphers and codes. As well as examining worldwide coding methods and practices, it was committed to the maximum extraction of information from signals intelligence. In 1922, the School was put under control of the Foreign Office. Navy, Army and Air Sections were added in the following years as Europe began to slide into war once more. Click on the image to enlarge:
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