"The NSA is believed to have strengthened DES"
No they didn't they cut the key size in half, and where can I find on a source that shows me that the s-box changes were intended to make DES stronger?
Alan Konheim (one of the designers of DES) commented, "We sent the S-boxes off to Washington. They came back and were all different."
[...]
Some of the suspicions about hidden weaknesses in the S-boxes were allayed in 1990, with the independent discovery and open publication by Eli Biham and Adi Shamir of differential cryptanalysis, a general method for breaking block ciphers. The S-boxes of DES were much more resistant to the attack than if they had been chosen at random, strongly suggesting that IBM knew about the technique back in the 1970s.
I'm done bickering about trivia, though. If you'd like the last word, as long as you don't say anything overtly stupid, I'm not going to respond. Happy holidays!
[...]
Some of the suspicions about hidden weaknesses in the S-boxes were allayed in 1990, with the independent discovery and open publication by Eli Biham and Adi Shamir of differential cryptanalysis, a general method for breaking block ciphers. The S-boxes of DES were much more resistant to the attack than if they had been chosen at random, strongly suggesting that IBM knew about the technique back in the 1970s.
I'm done bickering about trivia, though. If you'd like the last word, as long as you don't say anything overtly stupid, I'm not going to respond. Happy holidays!