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We recommned you to download "**A Windows installer for everything except PuTTYtel**" with **Pageant** (SSH authentication agent) and **PuTTYgen** (PuTTY key generator) which is available [here](http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html).
After installation you can proceed directly to private keys authentication using ["Putty"](putty#putty).
"Change Password for Existing Private Key" is optional.
"Generate a New Public/Private key pair" is intended for users without Public/Private key in the initial email containing login credentials.
* Run PuTTY
* Enter Host name and Save session fields with [Login address](../../../salomon/shell-and-data-access.md) and browse Connection - SSH - Auth menu. The *Host Name* input may be in the format **"username@clustername.it4i.cz"** so you don't have to type your login each time.In this example we will connect to the Salomon cluster using **"salomon.it4i.cz"**.
Select Attempt authentication using Pageant.
Select Allow agent forwarding.
Browse and select your [private key](ssh-keys/) file.
* Return to Session page and Save selected configuration with *Save* button.
* Enter your username if the *Host Name* input is not in the format "username@salomon.it4i.cz".
* Enter passphrase for selected [private key](ssh-keys/) file if Pageant **SSH authentication agent is not used.**
* Category - Windows - Translation - Remote character set and select **UTF-8**.
* Category - Terminal - Features and select **Disable application keypad mode** (enable numpad)
* Save your configuration on Session page in to Default Settings with *Save* button.
Pageant holds your private key in memory without needing to retype a passphrase on every login.
* Run Pageant.
* On Pageant Key List press *Add key* and select your private key (id_rsa.ppk).
* Enter your passphrase.
* Now you have your private key in memory without needing to retype a passphrase on every login.
PuTTYgen is the PuTTY key generator. You can load in an existing private key and change your passphrase or generate a new public/private key pair.
### Change Password for Existing Private Key
You can change the password of your SSH key with "PuTTY Key Generator". Make sure to backup the key.
* Load your [private key](../shell-access-and-data-transfer/ssh-keys/) file with *Load* button.
* Enter your current passphrase.
* Change key passphrase.
* Confirm key passphrase.
* Save your private key with *Save private key* button.
You can generate an additional public/private key pair and insert public key into authorized_keys file for authentication with your own private key.
* Enter a *comment* for your key using format 'username@organization.example.com'.
Save your new private key in "*.ppk" format with *Save private key* button.
You can copy public key out of the ‘Public key for pasting into authorized_keys file’ box.
* Export private key in OpenSSH format "id_rsa" using Conversion - Export OpenSSH key
* Now you can insert additional public key into authorized_keys file for authentication with your own private key.
You must log in using ssh key received after registration. Then proceed to [How to add your own key](../shell-access-and-data-transfer/ssh-keys/).