Dear guix, The openssh service is configured with a list of authorized keys, as a list of items, where each item is a list of 2 values, the user name (as a string) and the public key file (a file-like object). The service can be extended with new keys. To have multiple keys per user, we can put them on the same file-like object, each on its own line. However, if we put two different records, only the last one is remembered. This is a problem if we want to extend the service for users that already have a key. As I am trying to create a service that would convert GPG keys to SSH keys, I am in this exact situation: the users may have already defined SSH keys, and I want to add some more without losing the others. Best regards, Vivien