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Thank you. Adding a quick reference to ARX designs right away.

Edit: added these paragraphs:

Quick summary: Chacha20 is ARX-based hash function, keyed, running in counter mode. It embodies the idea that one can use a hash function to encrypt data.

The expert will immediately notice this quarter-round is an ARX based design (ARX stands for, Addition, Rotation, Xor) which despite its simplicity can be made as good as a regular permutation-substitution network.

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