:GROŠEK, Otokar - PORUBSKÝ, Štefan. Šifrovanie : Algoritmy, metódy, prax. 1. vyd. Praha : Grada, 1992. 268 s. Nestůjte za dveřmi. ISBN 80-85424-62-2. [Copy count : 2, currently available 2, at library only 0]
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