Putty Password-free automatic login Linux

1. Use the Puttygen.exe tool in the Putty installation directory. Click "Build (Generate)" and then move the mouse until the progress bar fills up to generate the key

Public key part: Copy the upper section of the text Select all. (Do not click "Save Public Key"), it is useless to click the saved public key! ）
Private key section: Click "Save private Key" to save a. ppk file.
Note: Do not add a password to the key file-add a password, each time you use the. ppk file you need to provide, it is a departure from the automatic login this purpose.

Automatic Login
Automatic authentication can be achieved by informing Linux and Putty of the public and private keys separately.

Public key file: Put it in a file in Linux.
Please log in to Linux with the Putty and password to enter the username. Use the command nano ~/.ssh/authorized_keys to edit the Authorized_keys file. -Usually this file does not exist, and the nano will open an empty file.
Glue the public key that you just copied down to the file. (Right-click in Putty is paste.) ）

Private key file: Available to Putty.
Each time putty login, in the "Connect with SSH-and authentication" option, "Authentication private key File" Select just the. ppk file can be automatically logged in.
(English version: Connection, SSH---Auth, Private keyfile for authentication)

Putty Password-free automatic login Linux