To authenticate yourself on the CLAIX cluster using SSH, you first need to [upload your SSH key to RegApp](uploading an SSH Key).
The CLAIX Cluster offers the option to authenticate yourself using SSH. What this means for everyday cluster use is detailed in [this article](Logging into CLAIX using SSH)
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You can associated already uploaded SSH public keys with your HPC account by clicking **Set SSH Key** underneath the service blurb on the [main dashboard](RegApp Dashboard) or via the menu ribbon at the top: **Registered Services → RWTH High-Perfomance Computing → Set SSH Key**.
If you have not registered with the HPC service, you will need to [do that](registering the HPC Account) first. You will also need to [upload your SSH key to RegApp](uploading an SSH Key) before you can associate it with a specific account.
Available SSH public keys that can be associated with the service are listed under **Set SSH Key** below the list of already associated SSH keys. For each key, the name and expiration date is listed.
To add it to the service account, click the **ADD** button. This brings up a dialogue to specify how the key should be associated. Two usage types are available: _Interactive_, i.e., to be used by the user when logging in to a session, and _Command_.
The latter option is intended for scripts that are executed without the user being present. A key that is associated with a command can only be used for executing that command and needs administrator approval before use.
Once you have filled out this dialogue, click **Add**. The SSH key is now associated with your account and is either waiting for administrator approval (_Command_-type association) or can be used immediately (_Interactive_-type association).
