[FreeBSD-Announce] HEADS-UP: OpenSSH DSA keys are deprecated in 12.0 and 11.0

Allan Jude allanjude at freebsd.org
Mon Aug 8 18:21:31 UTC 2016

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 at freebsd.org> wrote:
>> Which would you use?
>> 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 at 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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