3 ms·
NSA has both red and blue teams. Work from blue teams helps the public even if they are only known for their red team. Iirc we saw the blue team with S-Boxes in
by PartiallyTyped 3y ago
NSA has both red and blue teams. Work from blue teams helps the public even if they are only known for their red team. Iirc we saw the blue team with S-Boxes in DES, but I may be misremembering things.
- rockskon 3y agoTheir defensive side has, for many years, been very publicly and vocally sidelined in favor of offense. Defense being given the limelight is relatively new.
- red_admiral 3y agoYou are correct. Hardening the S-Box was the blue team (to protect against differential cryptanalysis). Weakening the key length from 64 to 56 bits by making the MSB of each key byte a checksum, that was the red team.
- PartiallyTyped 3y ago> NSA worked closely with IBM to strengthen the algorithm against all except brute-force attacks and to strengthen substitution tables, called S-boxes. Conversely, NSA tried to convince IBM to reduce the length of the key from 64 to 48 bits. Ultimately they compromised on a 56-bit key.[13][14] From wikipedia. Major compromise tbh :unamused: [13] Thomas R. Johnson (2009-12-18). "American Cryptology during the Cold War, 1945-1989.Book III: Retrenchment and Reform, 1972-1980, page 232" (PDF). National Security Agency. Archived (PDF) from the original on 2015-04-25. Retrieved 2015-07-16 – via National Security Archive FOIA request. This version is differently redacted than the version on the NSA website. [14] Thomas R. Johnson (2009-12-18). "American Cryptology during the Cold War, 1945-1989.Book III: Retrenchment and Reform, 1972-1980, page 232" (PDF). National Security Agency. Archived (PDF) from the original on 2015-04-25. Retrieved 2015-07-16 – via National Security Archive FOIA request. This version is differently redacted than the version on the NSA website.