Security alert: Please update your SSH keys

There is an ongoing attack against academic HPC centers in Europe right now, and several clusters and storage systems have been compromised. The attackers have used stolen credentials (passwords and/or SSH keys) to get into systems. We are investigating whether any of our systems are affected. In the mean time we encourage everyone to create new SSH keys. See https://documentation.sigma2.no/getting_started/create_ssh_keys.html for a description of how to create SSH keys. Please do set a passphrase on the keys, so they will be worthless if they should be stolen. Please also remember to remove old SSH keys from your ~/.ssh/authorized_keys file on each system (NIRD, Fram, Saga, Stallo, Vilje), so noone can use the old keys any more.