I think the practical barrier in the way of this is that one of the main ways the NSA “invents” new Suite A ciphers is by the cryptanalysis of cryptosystems of foreign militaries. The “defending the US” job is a consequence of the “attacking others” job; the crypto experts got to be crypto experts by breaking rival crypto.
This is also, in large part, why these cipher suites are classified—not because declassifying them would make them easier to cryptanalyze; but because it would tip off foreign powers that the US knows how their crypto works!
(And this is, of course, just as true of other weapons-systems development projects as it is of state-run cryptosystem developments.)
This is also, in large part, why these cipher suites are classified—not because declassifying them would make them easier to cryptanalyze; but because it would tip off foreign powers that the US knows how their crypto works!
(And this is, of course, just as true of other weapons-systems development projects as it is of state-run cryptosystem developments.)