Create ssh-key pairs

Update: April 11, 2023 - The German Federal Office for Information Security (BSI) requires a key length of at least 3000 bits for the RSA method with the expiration of the year 2023. Therefore, the Institute of Nuclear Physics will no longer accept RSA keys with 2048 bits for new applications. Existing users have been requested to generate new, BSI-compliant keys.

Update: May 15, 2020 - Due to a serious security incident on the university's HPC systems, all SSH keys used so far lose their validity with immediate effect.

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