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2015 Sep 11
3
sshd key exchange security
I was reading https://weakdh.org/sysadmin.html
They also have a very interesting paper as a PDF.
Anyway it appears that most ssh servers, when using DHE key exchange,
use the 1024-bit Oakley Group 2 and there is suspicion the NSA has done
the pre-computations needed to passively decrypt any tls communication
using DHE with that particular prime group.
They recommend setting the following: