This page explains how to set up PuTTY for login supercomputers.
Generate a key
Executing PuTTYgen, click on "Generate" and then move the mouse randomly over the blank area until a key is generated:
Put your "key passphrase" and then confirm it below. This key passphrase will be used as a password for login.
Click on ?"Save public key" and "Save private key" and save them.
Copy the Key appearing at the top and save it in a file saved in the same directory for the two keys above.
Register the generated key
Move onto the application portal site of Kyushu-U and login.
Click on "File Operation（ファイル操作）" and select .ssh directory.
Click on "Open Directory（ディレクトリを開く）" below the directory window.
Select "authorized_keys" and click on "Edit File （ファイル編集）" and a new window will popup . If the popup is prohibited, you need to change the security policy for this site.
Copy the generated key starting with "ssh-rsa" and save it.
Put "Host Name（ホスト名）" like "mikasa.cc.kyushu-u.ac.jp" for SR16000 or ""hakozaki.cc.kyushu-u.ac.jp" for HA8000.
Click on SSH -> Authentication（認証） and select the private key by clicking on "Select（参照）."
Click on "Session（セッション）" and put a name for the session, e.g., "SR16000" for mikasa.cc.u-tokyo.ac.jp.
Click on "Save（保存）"
Click on "Open（開く）" and now you can login using your account and key passphrase. You may encounter a message for the first time and just click on "Yes."