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Date: Sat, 4 Jul 2015 13:00:10 -0700
From: Bill Cox <>
To: "" <>
Subject: Re: [PHC] Memory-hard proof of work with fast verification (CPU Hash)

On Sat, Jul 4, 2015 at 11:45 AM, Solar Designer <> wrote:

> > With Yescrypt's further GPU defense, I think it would be fine.
> Sure, but this makes your 512 MB ROM sort of irrelevant for GPU attacks.
> They can have that 512 MB in their GPU card's RAM, and will run almost as
> fast (for a trivial enhancement of scrypt) or just as slow (for yescrypt
> with pwxform).
> Alexander

I guess I am more concerned about ASICs.  People still enjoyed LiteCoin
mining with GPUs, but ASICs ruined the BitCoin party for a lot of people.

I _think_ the ROM defends well against an ASIC attack.  So would
mutiplication chains and the random small memory I/O operations.  However,
an ASIC attack will probably run at it's I/O bandwidth to memory.


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