手元の
$ awk '{print $2}' .ssh/known_hosts | sort | uniq -c | sort -nr
16 ssh-ed25519
10 ssh-rsa
10 ecdsa-sha2-nistp256
ssh-rsaの鍵長は…
弱すぎの子は居ない感じだ
$ ssh-keygen -l -f ~/.ssh/known_hosts | awk '/\(RSA\)/{print $1}' | sort | uniq -c
6 2048
4 3072