William F. Friedman and the 2,400 Dead at Pearl Harbor
The man who broke the PURPLE cipher kept personal records on the disaster at Pearl Harbor, filling gaps the official history left blacked out for decades.
By Harlan Pryce ·
Cryptography
Herbert Yardley and a Redacted Lineage of American Codebreaking
A three-volume history of American cryptography remained secret for decades, and specific details of the pre-1940 era remain blacked out today.
By Vera Kessler ·
Miami Beach Hub Managed Secret Radio Nets Across 21 Nations
Axis spies and local collaborators were hunted through clandestine radio nets and intercepted cables in a surveillance dragnet that spanned the Caribbean and South America.
By Miriam Adler ·