Re: [Cfrg] Schnorr just as vulnerable to bad RNG
Rene Struik <rstruik.ext@gmail.com> Fri, 25 July 2014 14:16 UTC
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Date: Fri, 25 Jul 2014 10:15:49 -0400
From: Rene Struik <rstruik.ext@gmail.com>
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To: Bodo Moeller <bmoeller@acm.org>
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Subject: Re: [Cfrg] Schnorr just as vulnerable to bad RNG
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RFC 6979 - Deterministic Usage of the Digital Signature Algorithm (DSA) and Elliptic Curve Digital Signature Algorithm (ECDSA) (August 2013) On 7/25/2014 10:09 AM, Bodo Moeller wrote: > Dan Brown <dbrown@certicom.com <mailto:dbrown@certicom.com>>: > > Some people propose using deriving the ephemerals from the message > and a long term key. This does not seem any better as an algorithm > than the DRBG approach, provided the X9.62 algorithm is adhered to. > > There's an RFC melding both these ideas, but that is trying fix > something that is not broken, at the algorithm level. > > > It's certainly not broken, but more fragile than necessary. If you use > an appropriate PRNG with proper seeding, there's no problem, but in > practice, sometimes you *think* you have proper seeding when you > actually don't. That's usually bad in any case, but it can be less > bad with the hash-based approach. Since the additional cost of > hashing is minor, I think hashing is a good idea for implementations. > > (What document are you referring to? Really an RFC?) > > Bodo > > > > > > _______________________________________________ > Cfrg mailing list > Cfrg@irtf.org > http://www.irtf.org/mailman/listinfo/cfrg -- email: rstruik.ext@gmail.com | Skype: rstruik cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
- [Cfrg] Schnorr just as vulnerable to bad RNG Dan Brown
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG Bodo Moeller
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG Rene Struik
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG Bodo Moeller
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG Michael Hamburg
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG Stephen Farrell
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG David Jacobson
- Re: [Cfrg] Schnorr just as vulnerable to bad RNG Sandy Harris