The United States National Security Agency—the country's premier signals intelligence organization—recently declassified a Cold War-era document about code-breaking. The first two parts of the trilogy ...

Cryptologist [Lambros Callimahos] was a victim of his own success. He wrote a trilogy of books called Military Cryptanalytics covering code breaking in 1977. The first two volumes were eventually ...

Editor's note: This story was updated on Sept. 7, 2021 to reflect Jeuel Bannister Esmacher's alma mater. Jeuel Bannister Esmacher, 97, kept for decades the secret of her role in America’s World War II ...