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 certificates:
~~CESNET – CA for server certificatesh (HARICA RootCA 2015 - local copy in PEM format)~~

We are temporarely using Let's Encrypt certificates, use verification against system certificates

CA certifikáty:
ISRG Root X1 (Let's Encrypt root CA) ( ISRG Root X1 - local copy in PEM format)

Install certificates in OS Android

First, download certificates from above (highlighted in bold) 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.

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

In your Android device:

Go to Settings → Wi-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 „UserTrust CA“ 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.