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Ultra (cryptography)
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===Continued selective secrecy=== In 2012, [[Alan Turing]]'s last two papers on Enigma decryption were released to Britain's [[The National Archives (United Kingdom)|National Archives]].<ref>{{cite web|url=https://www.bbc.co.uk/news/technology-17771962|website=BBC|title=Alan Turing papers on code breaking released by GCHQ}}</ref> The Departmental Historian at [[GCHQ]] stated that the seven decades' delay had been due to their "continuing sensitivity... It wouldn't have been safe to release [them earlier]."{{cn|date=May 2025}}
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