Which precautions to protect against side-channel attacks on ARX ciphers?

Published: 13/08/2017
Which precautions to protect against side-channel attacks on ARX ciphers?
Source: CRYPTO.STACKEXCHANGE.COM

In recent crypto there has been a trend to design ciphers using only the ARX set of instructions - i.e. additions (modulo $2^{32}$ or $2^{64}$), rotations (by a fixed constant) and XORs, examples include Threefish , Salsa20 and ChaCha20 . One of the nicer, claimed properties of such ciphers is that they are supposedly easier to implement in a side-channel resistant fashion. Assuming one would want

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