Book Singh, Simon (1999)
The code book: The evolution of secrecy from Mary Queen of Scots to quantum cryptography. (/isis/citation/CBB000080091/) unapi

Book Kippenhahn, Rudolf (1999)
Code breaking: A history and exploration. Translated from the German, in collaboration with the author, by Ewald Osers. (/isis/citation/CBB000080074/) unapi

Article Ernst, Thomas (1998)
The numerical-astrological ciphers in the third book of Trithemius's Steganographia. Cryptologia (pp. 318-341). (/isis/citation/CBB000081359/) unapi

Article Reeds, Jim (1998)
Solved : The ciphers in Book III of Trithemius's Steganographia. Cryptologia (pp. 291-317). (/isis/citation/CBB000081369/) unapi

Book Marks, Leo (1998)
Between silk and cyanide: A codemaker's war, 1941-1945. (/isis/citation/CBB000083024/) unapi

Article Thurston, Hugh (1998)
Code-breaking in the Second World War. DIO (pp. 21-35). (/isis/citation/CBB000083034/) unapi

Article Biermann, Kurt-R. (1997)
Spiel mit Zahlen: Carl Friedrich Gauss als Codemaker. Kultur & Technik: Zeitschrift des Deutschen Museums (pp. 39-41). (/isis/citation/CBB000073758/) unapi

Article Pesic, Peter (1997)
François Viète, father of modern cryptanalysis: Two manuscripts. Cryptologia (pp. 1-29). (/isis/citation/CBB000071947/) unapi

Article Pesic, Peter (1997)
Secrets, symbols, and systems: Parallels between cryptanalysis and algebra, 1580-1700. Isis: International Review Devoted to the History of Science and Its Cultural Influences (pp. 674-692). (/isis/citation/CBB000078719/) unapi

Book Rosenheim, Shawn James (1997)
The crytographic immagination: Secret writing from Edgar Poe to the Internet. (/isis/citation/CBB000074398/) unapi

Article Ernst, Thomas (1996)
Schwarzweisse Magie: Der Schlüssel zum dritten Buch der Steganographia des Trithemius. Daphnis: Zeitschrift für Mittlerc Deutsche Literatur (pp. 1-203). (/isis/citation/CBB000079102/) unapi

Book Kahn, David (1996)
The codebreakers: The story of secret writing. [Revised edition]. (/isis/citation/CBB000071827/) unapi

Article Lee, John A.N.; Holtzman, Golde (1995)
50 years after breaking the codes: Interviews with two of the Bletchley Park scientists. IEEE Annals of the History of Computing (pp. 32-43). (/isis/citation/CBB000067788/) unapi

Book Hudson, Nicholas (1994)
Writing and European thought, 1600-1830. (/isis/citation/CBB000040624/) unapi

Book Weber, Ralph E. (1993)
Masked dispatches: Cryptograms and cryptology in American history, 1775-1900. (/isis/citation/CBB000033052/) unapi

Book Hinsley, F.H.; Stripp, Alan (1993)
Codebreakers: The inside story of Bletchley Park. (/isis/citation/CBB000034129/) unapi

Article Crawford, David J. (1992)
The autoscritcher and the superscritcher: Aids to cryptoanalysis of the German Enigma cipher machine, 1944-1946. Edited by Fox, Philip E.. IEEE Annals of the History of Computing (pp. 9-22). (/isis/citation/CBB000042514/) unapi

Article Principe, L.M. (1992)
Robert Boyle's alchemical secrecy: Codes, ciphers and concealments. Ambix: Journal of the Society for the History of Alchemy and Chemistry (pp. 63-74). (/isis/citation/CBB000055668/) unapi

Book Kahn, David (1991)
Seizing the Enigma: The race to break the German U-boat codes, 1939-1943. (/isis/citation/CBB000049299/) unapi

Chapter Voigts, Linda Ehrsam (1989)
The character of the carecter: Ambiguous sigils in scientific and medical texts. In: Latin and vernacular: Studies in late-medieval texts and manuscripts (p. 91). (/isis/citation/CBB000054280/) unapi