Which SSH keys are the *fastest*?
It seems that no one talks about this, but I'm SSH'ing into a container in my machine, I have no security concerns. I really want to use as little math as possible. But I can't seem to find which key types are actually the fastest.
Seems like a reasonable question? Or is that only for auth and another encryption is used for the connection?
@ted There was a similar problem I came across in Dec 2017 - see https://twitter.com/superruserr/status/944354391699673088
I guess it depends on the SSH moduli primes used?
@ted Have you got a way of measuring the speed overhead of different key algorithms? I think the reason you're not finding much discussion about it is because there is negligible difference, and you should only care if it's demonstrated to make a difference in your case.
@bignose yeah, that's probably the case. It just feels a bit wrong using keys of thousands of bytes for what is effectively a local socket.
@ted Knuth, re-phrased: Spending time optimising something you have no evidence is even a problem, is the root of a wasted evening :-)
The key should be only for auth. Test: pull the Yubikey that hosts it and your connection is still alive.
The really fast (insecure) connection encryptions are disabled in modern OpenSSH though.
In the past (don't ask for dates) you'd use the arcfour family. Today some aes-cbt as it seems.
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