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Re: [Taler] Clause Blind Schnorr Signatures

From: Oussema Settala
Subject: Re: [Taler] Clause Blind Schnorr Signatures
Date: Thu, 26 Sep 2019 16:29:45 +0200

I have heard Crown Sterling broke RSA (again) hahaha

On 2019-09-26 16:23, Christian Grothoff wrote:
> Interesting, albeit the paper doesn't (easily) give me some other key
> bits: do you have any idea on performance (CPU, message size)? Three
> moves _may_ not be an issue if we can integrate them with the
> refresh/reveal stages which are 3 move already anyway --- but of course
> that would always a major drawback for regular /withdraw operations.
> Overall, my first impression is that this doesn't really improve for us
> over RSA (3 moves, still not post-quantum) and has the obvious drawback
> of being very new and thus inherently not well-studied (and quite
> complex!).  So for now, I'd not even seriously consider switching,
> unless (1) we know for some reason that RSA blind signatures were broken
> beyond the point that increasing the key size would fix it, (2) this is
> somehow extended to a post-quantum scheme and we have a quantum
> computer, or (3) unexpectedly this thing trumps RSA by a significant
> margin in size and CPU speed (for same security level) *and* it has seen
> at least a decade of intense study ;-).
> My 2 cents
> Christian
> On 9/26/19 4:00 PM, Jeff Burdges wrote:
>> There is a recent paper https://eprint.iacr.org/2019/877.pdf in section 5 of 
>> which the authors produce a secure blind Schnorr signature in the algebraic 
>> group model plus OMDL.  In essence, it opens parallel signing queries and 
>> the signer random selects which to finish, which sounds fairly amenable to 
>> Taler, except blind Schnorr still need three moves, while blind RSA and 
>> blind BLS only need two,
>> Jeff

Oussema Settala
T: +491637567453
E: address@hidden

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