Product Description
This now declassified book was originally published in October, 1959 as a classified text by the U.S. Government. Repeating-key systems and their solutions are covered in-depth, as well as solutions for many types of periodic ciphers, polyalphabetic bipartite systems, monome-dinome systems with cyclic additives, periodic digraphic systems, etc. All solutions are supported by various described mathematical tests.
