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Zoom - Using end-to-end encryption

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Zoom meetings are TLS encrypted (like https). This secures the conference against third parties like hackers. The campus license of the university Paderborn is provided by a company located in Germany (Connect4Video GmbH – C4V). TLS encryption can’t secure the conversations against access of zoom or C4V. Both parties assure they don’t access the conversations but this can’t be guaranteed.

Confidential conversations can be held by using the end-to-end-encryption (E2EE). With this option, neither zoom nor C4V can access the content of the video conference. While using the end-to-end-encryption, not all zoom features are available. For end-to-end encrypted meetings, the Zoom client must be used. Joining the conference via browser is not possible.

Additional to the content of the conversations, zoom is gathering metadata. Examples are the IP address of the participants, device and hardware information, browser configuration, name and description of the meeting, date, time, duration of the meeting and number of participants. These information are available for zoom and C4V, even when the end-to-end-encryption is used. This information can be transferred to zoom USA for problem diagnosis and enhanced user experience. In case of privacy, gathering metadata must be seen critical. We recommend an evaluation if another service like BBB, Jitsi Meet, or DFNconf can be used which provides more privacy.

We recommend the usage of zoom only for conferences with significantly more than 20 participants. For smaller groups, services with more privacy should be used, like mentioned above. For conferences in which personal data is discussed, Jitsi Meet, BBB and DFNconf should be favored.

For conferences with confidential information like job interviews, appraisal interviews, appeal hearings, senate and chair conferences Zoom can only be used after a consideration of data protection laws by the host and only with activated end-to-end encryption.

For courses, lectures, seminars, conventions and public events, zoom normally can be used in default settings.

Requirements for E2EE

The participants need to have the zoom client in version 5.4.0 or newer installed. Joining via browser is not possible. (Feb 2021)


With activated end-to-end-encryption, the following features are not available: (February 2021)

  • Polling
  • Breakout Rooms
  • Cloud recording
  • Join before host
  • Live transcription
  • Live StreamingEntfernte Wiedergabe von Film oder Musik auf einem Endgerät via des Internets. Live-Streaming bezeichnet eine Echtzeitübertragung.
  • Join by phone

The following features are only available by using the Zoom Client in Version 5.5.0 or higher:

  • MeetingBesprechung mehrerer Personen über fachliche, organisatorische o. ä. Fragen. Zusatz: live wird verwendet, wenn diese über das Internet veranstaltet wird. reactions (like "raise hand")
  • 1:1 private chats

Joining end-to-end-encrypted meetings via browser is not possible.


Activate end-to-end-encryption

Use the following settings to activate end-to-end-encryption.

Zoom- Verschluesselung end-to-end 01.png

  • Use the Calendar to create a new Zoom meeting.

Zoom- Verschluesselung end-to-end 02.png

  • Activate end-to-end encryption.

End-to-end encryption as default

You can set end-to-end-encryption as the default setting for Zoom meetings. Open the Zoom account in your browser.

Zoom- Verschluesselung end-to-end 03.png

  • Click on „Settings“.

Zoom- Verschluesselung end-to-end 04.png

  • Click on „End-to-end encryption“ as default.

Verify encryption

In the meeting, the symbol in the top left hand corner shows you, which encryption is active.

Zoom- Verschluesselung end-to-end 05.png
Check on green shield. Only TLS encrypted. For non confidential meetings.
Zoom- Verschluesselung end-to-end 06.png
Lock on green shield. End-to-end-encryption active. For confidential meetings.

Compare the security codes, to check if the meeting is secure. Click on the green Symbol.

Click on "Verify".

The security codes need to match with each other.

See also

Bei Fragen oder Problemen wenden Sie sich bitte telefonisch oder per E-Mail an uns:

Tel. IT: +49 (5251) 60-5544 Tel. Medien: +49 (5251) 60-2821 E-Mail:

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