$ ssh-keygen -t ed25519 -C "zhangjc" Generating public/private ed25519 key pair. Enter file inwhich to save the key (/home/zhangjc/.ssh/id_ed25519): Created directory '/home/zhangjc/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/zhangjc/.ssh/id_ed25519 Your public key has been saved in /home/zhangjc/.ssh/id_ed25519.pub The key fingerprint is: SHA256:C/YxTF2P+qAR/xI0wfOkw13qvTo9siQGr+/erkOyvFA zhangjc The key's randomart image is: +--[ED25519 256]--+ | .. . | | .oo.o. | | o.+*.o. | | o ++o+ | | o E =o . | | . +.O.=. . | | ..++= +. . | | .oo.=o + | | o==+== . | +----[SHA256]-----+