SSH public key authentication + optimization

An SSH public key authentication process:

Sshclinet machine: Generate Public private key (public key equivalent to a lock)

Sshclient: Sends the public key to Sshserver (throws the lock)

Sshclinet Sshserver don't need a key.

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Two SSH optimizations

cat/etc/ssh/sshd_config , add a second.

Port 22#SSH connecting the default ports

Permitrootlogin Yes #root用户黑客都知道, prevent it from logging on remotely

Permitemptypasswords No #禁止空密码登录

Usedns No #不使用DNS

Gssapiauthentication No

Three SSH connection slow resolution

3.1

Cat/etc/ssh/sshd_config

Usedns No #不使用DNS

Gssapiauthentication No

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Add host name resolution in 3.2hosts file

SSH public key authentication + optimization