Another Recently Released NSA Document
American Cryptology during the Cold War, 1945-1989, by Thomas R. Johnson: documents 1, 2, 3, 4, 5, and 6.
In response to a declassification request by the National Security Archive, the secretive National Security Agency has declassified large portions of a four-part “top-secret Umbra” study, American Cryptology during the Cold War. Despite major redactions, this history discloses much new information about the agency’s history and the role of SIGINT and communications intelligence (COMINT) during the Cold War. Researched and written by NSA historian Thomas Johnson, the three parts released so far provide a frank assessment of the history of the Agency and its forerunners, warts-and-all.
Randall • January 2, 2009 1:31 PM
Just read the bit on non-government cryptography (document 6, the page numbered 231). It’s disturbing that at the time of the history, NSA still looks at public cryptography almost entirely as a threat.
I wonder if they’ve updated their calculations at all now that we’re clearly threatened by the insecurity of nonmilitary SCADA systems and the like, and now that plenty of crypto smarts is coming from .
The history is misleading when it suggests prepublication review blocked very little — it kept Khufu and Khafre from being published and that seems substantial.
It also says that in 1987, NSA suggested a more sophisticated successor to DES, but banks didn’t want it. Is that public? NSA says Skipjack was developed in 1987, so that might be the algorithm they mean.