Date: Mon, 8 Aug 2016 14:21:26 -0400 From: Allan Jude <allanjude@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: [FreeBSD-Announce] HEADS-UP: OpenSSH DSA keys are deprecated in 12.0 and 11.0 Message-ID: <6e97cb0a-0f9b-b60c-a762-454c3f257903@freebsd.org> In-Reply-To: <CAG6CVpV0tVCE%2BDyHTgMF6CzRBnV8YNs92DY3c7k13SY7Trhn3w@mail.gmail.com> References: <20160805015918.GI43509@FreeBSD.org> <86CE9314-487D-4D63-8CE1-34F167765EC5@freebsd.org> <CAG6CVpV0tVCE%2BDyHTgMF6CzRBnV8YNs92DY3c7k13SY7Trhn3w@mail.gmail.com>
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On 2016-08-08 14:17, Conrad Meyer wrote: > The OpenSSH defaults are intentionally sane. RSA 2048 is anticipated > to be fine for the next 10 years. It would not be a bad choice. I'm > not aware of any reason not to use EC keys, and presumably the openssh > authors wouldn't ship them as an option if they knew of any reason to > believe they were compromised. > > Best, > Conrad > > On Mon, Aug 8, 2016 at 10:56 AM, Devin Teske <dteske@freebsd.org> wrote: >> Which would you use? >> >> ECDSA? >> >> https://en.wikipedia.org/wiki/Elliptic_curve_cryptography <https://en.wikipedia.org/wiki/Elliptic_curve_cryptography>; >> >> "" In the wake of the exposure of Dual_EC_DRBG as "an NSA undercover operation", cryptography experts have also expressed concern over the security of the NIST recommended elliptic curves,[31] <https://en.wikipedia.org/wiki/Elliptic_curve_cryptography#cite_note-31>; suggesting a return to encryption based on non-elliptic-curve groups. "" >> >> Or perhaps RSA? (as des@ recommends) >> >> (not necessarily to Glen but anyone that wants to answer) >> -- >> Devin >> >> >>> On Aug 4, 2016, at 6:59 PM, Glen Barber <gjb@FreeBSD.org> wrote: >>> > This is a heads-up that OpenSSH keys are deprecated upstream by OpenSSH, > and will be deprecated effective 11.0-RELEASE (and preceeding RCs). > > Please see r303716 for details on the relevant commit, but upstream no > longer considers them secure. Please replace DSA keys with ECDSA or RSA > keys as soon as possible, otherwise there will be issues when upgrading > from 11.0-BETA4 to the subsequent 11.0 build, but most definitely the > 11.0-RELEASE build. > > Glen > On behalf of: re@ and secteam@ > As far as I know, the "advantage" to ED25519 keys, is that you can build openssh without openssl, if you forgo supporting RSA etc. -- Allan Jude
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