The Washington Post
"Kahn has produced a
tour de force…. The volume is an anthology of a hundred
detective stories, one more ingenious than the last, and all
real, central to the fate of armies and kingdoms…Magnificent."
blockbuster… for many evenings of gripping reading, no better
choice can be made than this book."
"Perhaps the best and
most complete account of cryptography yet published."
The New York Times
achievement… Mr. Kahn has presented the specialist and the
general public with a lavishly comprehensive introduction to a
subject of basic significance for both."
National Security Agency evaluation, now declassified
"The book in its
entirety constitutes the most publicly revealing picture that
has ever been presented of U.S. Sigint activities and the
agencies engaged in this field."