Security News > 2018 > July > Declassified files reveal how pre-WW2 Brits smashed Russian crypto

Moscow's agents used one-time pads, er, two times – ой! Efforts by British boffins to thwart Russian cryptographic cyphers in the 1920s and 1930s have been declassified, providing fascinating insights into an obscure part of the history of code breaking.…

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http://go.theregister.com/feed/www.theregister.co.uk/2018/07/19/russia_one_time_pads_error_british/