I wouldn't be that sure. The NSA made DES _more_ secure in the 1970s by influencing IBMs design of the S-Boxes, regular cryptography research didn't even discover this until 1992.
This means that the NSA understood differential cryptanalysis 22 years before non-NSA researchers did. Their ability to brute force is meaningless if they have techniques to obviate it's necessity.
This means that the NSA understood differential cryptanalysis 22 years before non-NSA researchers did. Their ability to brute force is meaningless if they have techniques to obviate it's necessity.