by Frederick W . Winterbotham (Author)
Operation Ultra was designed to intercept and decode German signals sent using Enigma, the top-secret German cypher machine. F.W. Winterbotham, was the man responsible for the organization, distribution and security of Ultra. This is his personal account of the operation.
Format: Paperback
Pages: 224
Edition: New Ed
Publisher: Orion
Published: 07 Dec 2000
ISBN 10: 0752837516
ISBN 13: 9780752837512