lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 1 Sep 2014 13:27:05 +0200
From: Dmitry Khovratovich <khovratovich@...il.com>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>
Subject: Re: [PHC] A review per day - RIG

If you want to give a proper credit to the bit-reversal permutation in the
context of time-space tradeoffs, then it must be given first to Lengauer
and Tarjan (STOC'79, http://dl.acm.org/citation.cfm?doid=800135.804420 ),
who explored and proved the lower bound for the 1-layer case. The
bit-reversal permutation itself has been widely used even earlier, e.g. in
the context of FFT.

Best regards,
Dmitry


On Sat, Aug 30, 2014 at 12:01 AM, Bill Cox <waywardgeek@...hershed.org>
wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> As far as I can tell, RIG is a quick rewrite of Catena, using Lyra2's
> hash function, and Gambit's XOR-ing over data.  The combination is
> original, but that's all.  If the paper said, "We have combined these
> three good ideas and thing the result is superior", then I would be OK
> with it.  For example, someone needs to plug Lyra2's ultra-fast sponge
> into Gambit.  Mixing ideas is fine.  I just think it's weird pasting
> three ideas from the forum together without crediting the sources
> properly.  It almost seems like they attempted to obfuscate their
> sources.  The paper and code are all original (mostly), so there's no
> plagiarism here.  You can't copyright an idea.  However, it's
> offensive to use other's ideas and pretend they are your own.  All
> that is needed to fix RIG, IMO, is some proper credit to where they
> got their ideas, and a rewrite of their paper to be less dick-ish.
>
> For example, here's a statement in the RIG paper:
>
> "Therefore, it is recommended in [6] to have password-independent
> memory access patterns for a password hashing scheme. We have
> attempted to follow this requirement using bit reversal permutation."
>
> Why not credit Catena for the bit reversal pattern while they were at
> it?  Did they actually rip off Lyra2's hash function and not give them
> credit?  Multiple entries use the XOR-ing thing, so I have less
> trouble with that, but it follows a pattern...
>
> RIG's single-round Blake2b hash function happens to be identical to
> what Lyra2 uses.  They either both copied the exact same text from the
> exact same source, or RIG's hash function was actually copied from Lyra2.
>
> The XOR-ing over memory is an idea from Gambit that we talked about
> quite a bit.  Now that I've found that writing to a memory location
> just read from is quite fast compared to writing to a different
> location, I am a fan.
>
> Anyway, I feel RIG = Catena + Lyra2's hash + Gambit's XOR.  This is
> likely a good combination, but I have to feel for the Catena, Lyra2,
> and Gambit authors when their work is not credited properly.  I
> haven't done much analysis of the RIG code because it bothers me to
> read it... for example the memory swapping algorithm that the Catena
> guys invented fairly recently is there...
>
> Anyway, RIG is the last entry I'm posting about today!
>
> Bill
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1
>
> iQIcBAEBAgAGBQJUAPgfAAoJEAcQZQdOpZUZS9YQAIF1BpnhjNkBspxYtcqg+dou
> OaiaKr/7lPOSidwmLeV1Jxlbll0XjZ5pZDXUWy2EYmrB9FmZhZDmrLuP9pwhzeBy
> ZYjErWoi63A49fo1YffKa4oOxrKywneCxr9NMR3Z5GBbUL+mKzYl+FVNTZ+vQlsO
> ACzARgcwGRMRbr0QeFOczvIgmE3F2UmO3hBDwvKhvUTTn85/3W6I22oksOB5Z/X4
> GEcrUC66gjv5X3HL1NboE8cvYzmn+t/Oy/qJVgQigZXGp2eOxfdPuYwe0DzBqIZ+
> +myVo02oni2zr32uTsonLg6hyYaOBF2RY4I1ftrTkYiUEnqiz6XG8tgKX2wfLpmb
> TArs6bsxFlCxbiZ2k3SM7NDh/AGlOE/4QBDyFt5zzHtF28PL8YoJokIP1n1RgEO2
> UbI/ZkRUKaqb7A5lEvmv6gK/cSzfQ9prv9mkhz2vTyLVrfwBdRFhqx3tkJsuDYe8
> KciVGWFLAwdb6KtyoogzyQJfpMuLCsMuT75F2lECBO1Bk5xn5TMaQfInSfngvh14
> W3tF9PvTnv5f2FMRpVXFc4VGmGhC/1qwQZzaII6yRYnFP+BuHi6NntyuczLsoF73
> CqJ+PCtMrEjF/jqDjO0nRvRrUCvMsSD5bvA9G7HHVL8noFrM7Riqs4vNzw799sWE
> RFwFL77udT1rmipHFmPX
> =3b8c
> -----END PGP SIGNATURE-----
>



-- 
Best regards,
Dmitry Khovratovich

Content of type "text/html" skipped

Powered by blists - more mailing lists