Bug#774711: openssh and putty
Matt Taggart writes:
> * ecdh-sha2-nistp256, ecdh-sha2-nistp384, ecdh-sha2-nistp521
> (2014-11-02,0.64))
> * curve25519-sha256@libssh.org (2015-05-09, 0.65)
This and other items appear to infer which PuTTY releases contain
features by comparing the dates the features were checked in to master
and the release dates of PuTTY releases.
In fact PuTTY 0.64-0.67 inclusive were released from branches.
Elliptic-curve algorithms are not yet in any released version of PuTTY.
<http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/> refers.
> If you want to support squeeze(released 2011-02) and newer and putty
> 0.63(released 2013-08) and newer [...] then the minimum modern options
> you need are: [...]
(The above doesn't change your conclusion here though.)
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