Certificates - verifying our network identity

In case you need our RADIUS server certificate, or the Certificate Authority certificate, we offer download below.

Local copies are also available below.

CA certificate:
TERENA SSL CA 3, DigiCert Assured ID Root CA (link to CESNET)

RADIUS certificate:
radius.sin.cvut.cz (link to CESNET)

RADIUS server fingerprint:
SHA1: 9B 72 81 39 25 A9 0D 1C BC B7 7B 98 BE 92 32 C7 FC 4D EA B6
MD5: 1D BF 76 05 02 52 29 AB E1 81 54 80 AE 23 A6 CF

To save these to your device, right-click/tap-and-hold on these links and select Save link as… / Save target as…

DigiCert Assured ID Root CA - PEM
DigiCert Assured ID Root CA - DER

First, download these certificates into your Android device. We recommend using Chrome or integrated browser to perform the download, or download them using your laptop/computer and transfer to your Android using a USB cable or an SD card.

DigiCert Assured ID Root CA - PEM
DigiCert Assured ID Root CA - DER

The following instructions differ from device to device, but they all follow the same theme:

In your Android device:

  • Go to SettingsWi-Fi.
  • Go to Advanced Wi-Fi. This can be hidden in a context menu.
  • Choose Install a certificate.
    • A file browser should open. Find your downloaded certificate file (usually in “Downloads” directory) and tap the file. (You only need to install one of the PEM/DER. If one fails, try the other one.)
    • Follow the instructions on your device. Choose a name for the certificate, like “DigiCert” or “Sincoolka”.
    • Choose Wi-Fi as a certificate type, if possible.
    • Confirm the installation.
  • Then, during setting up Wi-Fi, select this new certificate as a CA certificate.
When you remove the Sincoolka Wi-Fi settings, the saved certificate might also get removed. Therefore, you might need to repeat the procedure above.