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Cryptologia, 1990
This article is an exposition of a pencil and paper cipher used by Soviet secret agents working inside the U. S. that successfully defied the government's computer-aided attempt at cryptanalysis for several years.
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This article is an exposition of a pencil and paper cipher used by Soviet secret agents working inside the U. S. that successfully defied the government's computer-aided attempt at cryptanalysis for several years.
openaire +1 more source