[jandrewrogers]

FWIW, the US government actively develops and maintains a suite of classified cryptography algorithms[0] which are completely separate from the suite of algorithms they publish publicly. The reason for the existence of Suite A algorithms has never really been explained. I’ve heard rumors that it contains capabilities not known in public cryptographic algorithms, but that’s speculation.

[0] https://en.wikipedia.org/wiki/NSA_Suite_A_Cryptography

[bigfatkitten]

They do, and there are a lot of situations in which those algorithms are not usable, such as on mobile devices, hence the introduction of Suite B and now CNSA.