Helvetios Cluster

Fidis Cluster

Deneb Cluster

All clusters

SSH Host Keys change

Be aware that you will see a warning upon logging into the clusters:

WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

This is normal as the ssh host keys changed, please see the following webpage for the current keys: Connecting to the clusters

User SSH keys

We have deleted all users .ssh  as a precaution measure.

The attacks reported on other HPC sites seem to have been using compromised user SSH keys.

Knowing that:

Since it is impossible to get a full list of keys that might have been compromised at other sites, and to check which other accounts and (potentially) keys those compromised keys might have given access to, we chose to err on the side of caution and remove all private and public keys from all accounts.

We understand this might be cumbersome but it is the only way to ensure that any eventual unauthorized access has been closed.