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Dewdney, A.K.: Moderne Computer-Verschlüsselungsmethoden (1989)
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tz: Enzyklopädie des 21. Jahrhunderts (2001)
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Flechtheim, O.K.: Dreimal Zukunft : ein Weg zum homo humanus (1983)
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Bauer, F.L.: Entzifferte Geheimnisse : Methoden und Maximen der Kryptologie (1997)
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Bauer, F.L.: Entzifferte Geheimnisse : Methoden und Maximen der Kryptologie (2000)
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