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Review of Code Warriors: NSA's Codebreakers and the Secret Intelligence War against the Soviet Union by S. Budiansky

It is time to explore cryptology during the Cold War. Much has been published about cryptology in the first half of the twentieth century, in particular, about the codebreakers, machines, and ciphers of World War II. Even details of World War II cryptanalysis appear in print. Then, there is a gap. Then, beginning in the second half of the 1970s with the publication of the Diffie-Hellman paper and with the design of the Data Encryption Standard, cryptology began to show a public face. People in academia and business began creating and attacking cryptosystems, and, at least the academic researchers, began publishing. Perhaps, for most of the time since 1976/1977, our need for detail about the problems and technical aspects of cryptology has been satisfied by the rapidly developing, visible portion of cryptology. But, there is the gap. During the gap between World War II and the mid-1970s, U.S. SIGINT agencies unified, post-war cryptographic machines were developed, mathematicians were becoming the “princes of the cryptologic realm,” digital became the way of communication, and computers became the new cryptanalytic tools and the new encryption machines. Most cryptology was done by government agencies or under government contract, and the details mostly remain classified. The focus of U.S. cryptologic agencies was the Soviet Union, which is the story told in Code Warriors. Some of the history of Cold War cryptology appeared before Code Warriors. The unification and organization of U.S. SIGINT that occurred after World War II and some cryptologic events that occurred during the Cold War have, for example, been discussed in books by Aid (2010) and Bamford (1982, none defined