שימוש במפתח צפנה במקום סיסמא בגישה לשרתי לינוקס

First, Login to the Linux machine and generate the key by command

ssh-keygen -t dsa -b 1024 -f $HOME/.ssh/id_dsa

just hit enter each time it asks for the passphrase, or enter a passphrase.

when done, authorize the key by coping it and set prper permissions on it.

cat $HOME/.ssh/id_dsa.pub >> $HOME/.ssh/authorized_keys
chmod 750 $HOME/.ssh
chmod 640 $HOME/.ssh/*

now we should down load the key to the client computer, use scp/sftp or copy & paste the output of

cat $HOME/.ssh/id_dsa

copy all text including the -----BEGIN DSA PRIVATE KEY----- and -----END DSA PRIVATE KEY-----

save the life with .pem extension.

the file is now ready to use with ssh on Linux, Unix or Mac by

ssh -i administrator-ubuntu.pem administrator@192.168.X.Y

to use this key file with putty under Windows we need to convert it to .ppk file, using PuTTYgen

load the private key

after successful loading the key, save the private key as .ppk file

now we can use it with PuTTY,  under Connection  category, set your username at the Data

and the path to the private key at SSH Auth

or use command line

putty.exe -i C:\Keys\administrator-ubuntu.ppk administrator@192.168.X.Y

enjoy.