How To Use Putty-generated RSA Key To Login Linux OpenSSH Server?
You have to make changes to Putty-generated RSA public key in order to remotely access Linux server over SSH protocol.

You have to make changes to Putty-generated RSA public key in order to remotely access Linux server over SSH protocol.
You cannot append or insert Putty-based RSA key to authorized_keys file of OpenSSH. A little bit of changes is necessary to authenticate with OpenSSH server using the Putty-generated RSA Public-key.
If you forgot to backup Putty-based RSA public key that lost during server reinstallation, Puttygen can regenerate the public-key from its private-key.
Do you know what causes the SSH or SCP slow login prompt problem? Check this out.
There is a trick to install public key generated by Puttygen into OpenSSH server. Otherwise, Putty will fail to authenticate with OpenSSH server with rejection message that says “Server refused our key”.
If you really can’t live with Linux without using the insecure telnet protocol, how could you install and turn on the telnet daemon in Linux server?
If your local disk has insufficient free disk space to keep the tarball (tar archive or .tar file), why not perform tar over SSH to create or extract the tarball at remote server?