[dianthrow]

ARX in this case is referring to Add Rotate XOR, which is a common construction for hash functions. You are referring to the language.

[iaabtpbtpnn]

Is ARX a common term in the literature? I have never seen it used before this post (though I'm not exactly up to date on the latest crypto...)

[cmrx64]

yes. https://www.nist.gov/sites/default/files/documents/2016/10/1... https://www.cosic.esat.kuleuven.be/ecrypt/courses/albena11/s...