The Presumed Certificate Authority

Installing the CA Certificate | Why have the Certificate Authority? | Certificates we've signed | Additional notes |
Latest certificate: To install to your browser, click on the CA certificate link and follow your web browser's on-screen instructions. Please note that on some new web browsers, you may need to download the certificate first. You may use the links below it to verify the fingerprint.

Installing the CA Certificate

After downloading, run the following commands as root: # mkdir /usr/local/share/ca-certificates/presumed # cp cacert.crt /usr/local/share/ca-certificates/presumed/ # update-ca-certificates -f

Microsoft Windows
Open the certificate. If you get an "Open File - Security Warning" window, click "Open".

On the Certificate window, select "Install Certificate".

On the Certificate Import Wizard, select "Local Machine", click "Next", and accept the User Account Control prompt. On the Certificate Store scree, select the Trusted Root Certification Authorities store, and click "Next" again to save the certificate.

Mac OS X
Open the certificate, and add to the "System" certificate store.

Why have the Certificate Authority?

We use TLS in order to allow for encrypted connections to our non-Internet network services and our user's machines, all with SSL/TLS certificates provided by our own certificate authority.

Please note that this CA no longer signs for domains on the global Internet. You will want to consider using other solutions for such certificatess.

Certificates we've signed

CA Certificates


Server Certificates


Client Certificates


Additional notes

You may need to install a copy of the certificate on your OS or web browser if you are seeing errors that the certificate authority is invalid.

If you share a copy of our CA certificate, please link back to this page, or check back occasionally to ensure your file(s) are current.

Anton McClure /
Last modified: Thu Apr 11 15:56:56 EDT 2024