Re: [Cfrg] OPAQUE at Facebook

Björn Haase <bjoern.haase@endress.com> Wed, 28 August 2019 03:18 UTC

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From: =?utf-8?B?QmrDtnJuIEhhYXNl?= <bjoern.haase@endress.com>
To: Bill Cox <waywardgeek@gmail.com>, Kevin Lewi <klewi@cs.stanford.edu>
CC: IRTF CFRG <cfrg@irtf.org>
Thread-Topic: [Cfrg] OPAQUE at Facebook
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Subject: Re: [Cfrg] OPAQUE at Facebook
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Hi to all,

as one of the ones who nominated a candidate for augmented PAKE (AuCPace) I can confirm that the CFRG reviewers are presently very active and reviewing e.g. the proof strategies in detail. I agree that memory-hard password hashing should be used (in my proposal, I have suggested scrypt, but Argon2 is also a decent choice).

I also agree that we should really have a standardized protocol that mandates use of strong password hashes also for applications such as social media.

Yours,

Björn.


Mit freundlichen Grüßen I Best Regards 

Dr. Björn Haase 

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Von: Cfrg <cfrg-bounces@irtf.org>; Im Auftrag von Bill Cox
Gesendet: Mittwoch, 28. August 2019 02:47
An: Kevin Lewi <klewi@cs.stanford.edu>;
Cc: IRTF CFRG <cfrg@irtf.org>;
Betreff: Re: [Cfrg] OPAQUE at Facebook

It would be great to hear from this group on where the community
stands with the standardization of augmented PAKEs.

- Kevin

I, for one, would say great minds think alike :)  The OPAQUE RFC could use some tweeks, but looks pretty strong, IMO.  For example  they're recommendation of iterating a password hash should be replaced with calling Argon2.  Note that Argon2 runs pretty fast in browsers that support web assembly.  Password hashing has to be done client-side in OPAQUE, with the possible exception of using Makwa delegated hashing possibly in paraallel with the OPRF round-trip.