phc-discussions - Re: [PHC] Re: Attack on Argon2i?

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Message-ID: <CAOLP8p437LTNjPC93OFL0gc_+YC=QS9ru5==0sBRYkYfsJPQYQ@mail.gmail.com>
Date: Tue, 12 Jan 2016 09:30:07 -0800
From: Bill Cox <waywardgeek@...il.com>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>
Subject: Re: [PHC] Re: Attack on Argon2i?

I confirmed what the paper said with a small test program you can get from
github <https://github.com/waywardgeek/argon2memtest>.  Here's the output
when run using 2^26 1KiB blocks:

./argon2memtest $((1 << 26))
Max blocks used 12409040 out of 67108864.  Memory reduction 5.41X

So, the memory reduction without recomputations is actually closer to
5.41X, in single-pass mode.  While higher than I was expecting, the
recommended minimum t_cost for Argon2i is 3, and should remain 3.  I
personally would generally use Argon2i with t_cost of 3, while Argon2id
with t_cost of 1.

Bill

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