@book{ title = "Geheime Botschaften", author = "Singh, Simon", year = "2000", publisher = "Büchergilde Gutenberg", address = "Frankfurt am Main [u.a.]", title = "die Kunst der Verschlüsselung von der Antike bis in die Zeiten des Internet", language = "ger", howpublished = "print", isbn = "3763250670", keywords = "Einführung,Kryptologie,Geheimschrift,Enigma", pages = "22 cm", note = "Literaturverz. S. 463 - 468", }