as far as i understand it, ciphertext is indistinguishable from random text. and, afaik, this is true of all modern algos. so, how do you notice they switched? you don't.
you only notice once they call upon the more public parts of gov to switch to another 'secure' algo. also, NSA themselves probably use the Suite A algos that we know batshit about.
but, reality check: THIS IS ALL SPECULATION. there is no evidence that they have broken anything.
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as far as i understand it, ciphertext is indistinguishable from random text. and, afaik, this is true of all modern algos. so, how do you notice they switched? you don't.
you only notice once they call upon the more public parts of gov to switch to another 'secure' algo. also, NSA themselves probably use the Suite A algos that we know batshit about.
but, reality check: THIS IS ALL SPECULATION. there is no evidence that they have broken anything.