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I have been researching ARX algorithms, but I would like to know how well does ARX (both single or multiple rounds of) provide diffusion compared to an s-box or an SP network.

Also, are there any modifications you can make to an ARX algorithm to make it provide more diffusion?

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    $\begingroup$ A single step of ARX doesn't do nearly as much diffusion as a good sbox; however each step of ARX is real cheap (at least, on a CPU), so you can throw a lot of rounds at the problem... $\endgroup$ – poncho Apr 28 '17 at 15:50

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