[Cryptography] The Energy Budget for Wireless Security shows cryptography is cheap

[Ryan Carboni]

https://eprint.iacr.org/2015/1029

Communication costs 99% of energy costs, thus decisions to use Speck is
wholly pointless. One could use the original 256-bit Threefish. One could
use Threefish with triple the number of rounds.

This is a recurrent problem. Focusing on individual cipher costs while
ignoring protocol costs wastes time towards pointless optimizations which
could prove insecure and vulnerable (needless reductions in security
margins). ChaCha's speed likely does not add any true benefit when
asymmetric cryptography is factored in.
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