Create ssh-key pairs

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.

If you need access to the computer network of the Institute of Nuclear Physics, please generate a *new* SSH key pair. Use a particularly good passphrase, your email address (Uni-Mainz or home institute) as comment.

Under no circumstances should you omit the passphrase. As you can see, one single careless person is enough to cause inconvenience to the whole university. Do not be that person!

If possible, create an ed25519 key:


ssh-keygen -t ed25519


Two files are created:

  • Your public key ~/.ssh/ should be sent to, with the request to add you to the ssh gateway.
  • Your private key ~/.ssh/id_ed25519 will be activated with your passphrase. Passphrase and private key are to be kept secret and must not be given to anyone - not even to us.

Alternatively, you can also generate rsa keys. However, this is only useful if you need access to older systems. The key length should be at least 3072 bits, but not more than 4096 bits. It does not make sense to increase the rsa key length further. The gain in security is minimal, the handling is very difficult and the algorithm becomes even slower. If you have security concerns, use the ed25519 keys.

If you yourself have access to a machine for which you want to set up remote access, you can also add the public key yourself to the ~/.ssh/authorized_keys file.

Alternative for older Windows versions:

Please follow our instructions for generating SSH keys with PuTTY.


HDMI Extender for the lecture hall

As the VGA operation of the beamer in the lecture hall of the KPH proved to be unreliable, an HDMI/VGA Extender was installed - initially provisionally. We are currently preparing a permanent installation, also for the second beamer in the lecture hall.

If you need or want to help yourself, here are some points you should consider:

  • When using the HDMI Extender, the beamer input MUST be switched to "Eingang 1 - DVI-D (HDCP)" via remote control.
  • You will probably want to connect your notebook via HDMI or VGA. You don't need to bring the cables yourself. We have them here in stock.
  • Please do not confuse HDMI and Display Port!
  • There is also a display port and a DVI port. We also have these cables in stock if you need them.
  • Here is also a photo with the connections.

If you still need help, instructions or cables and adapters for your notebook, please call the following numbers:

  • 25855: Herr Almeida Sousa und Herr Androsov.
  • 25868: Herr Kreim

Europractice membership

The Johannes-Gutenberg-University Mainz is a Europractice member.

What is Europractice?

Europractice offers state-of-the-art design tools as well as an MPW prototyping and packaging service to European universities and publicly funded research institutes for microelectronic and microsystem design.

JGU-Mainz Europractice representative:
Dr. Ulrich Schäfer (uschaefe (at)

JGU-Mainz Europractice Licenses are currently served by PRISMA.
Dr. Andrea Brogna (abrogna (at)

Any requests to Europractice should be routed through Dr. Ulrich Schäfer and Dr. Andrea Brogna

Current software portfolio: Xilinx, Mentor, Cadence, Intel/Altera.

Please note that some of these software licenses are strictly limited in number and usage conditions. Therefore, dependent on what exactly you require, you might have to sign additional documents, and/or you might have to provide the required funds to upgrade the license pool. So please, in any case of doubt, provide a short description of what you need and what you need it for and contact both Ulrich Schäfer and Andrea Brogna.

In case you require any tools that are not currently licensed to Mainz University you are advised to check the details at first and then contact Dr. U. Schäfer & Dr. A. Brogna.

Please note that any purchase of software tools via Europractice would typically take about 2 months, once all paperwork is completed. NDAs and license agreements will be required for any new software packages. Please see the Europractice web page for licensing conditions. Generally speaking: Strictly non-commercial, education/research only.

Eligible for use of Europractice licenses: JGU-Mainz employees and students only, with currently valid contract/enrolment. Access to the licenses is tightly controlled, according to the licensing conditions.