- theoretically unbreakable
- теоретически невскрываемый.
English-Russian cryptological dictionary . 2014.
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теоретически невскрываемый — — [http://www.rfcmd.ru/glossword/1.8/index.php?a=index&d=4735] Тематики защита информации EN theoretically unbreakable … Справочник технического переводчика