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Hellmann, M.E.: ¬Die Mathematik neuer Verschlüsselungssysteme (1979)
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Ruhmann, I.: Vor dem Ende des Chiffren-Monopols (1996)
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Semar, W.: Kryptografie (2004)
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Hill, J.R.: Library Literature on CD-ROM (1995)
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Grieser, F.; Weiss, H.: ¬Der Schlüssel zur Sicherheit (1997)
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