Media type: E-Article Title: AN EARLY CIPHER DEVICE: FREDRIK GRIPENSTIERNA'S MACHINE Contributor: Beckman, Bengt Published: Informa UK Limited, 2002 Published in: Cryptologia, 26 (2002) 2, Seite 113-123 Language: English DOI: 10.1080/0161-110291890821 ISSN: 0161-1194; 1558-1586 Keywords: Applied Mathematics ; Computer Science Applications Origination: Footnote: