This may be because that your operating system does not recognise 'Alpha CA' as an appropriate register. Our SSL is perfectly safe - this message is simply appearing because 'Alpha CA' is not recognised.
I just checked the boru security certificate - it looks fine :wink:
However, if you are worried about security, then here are a couple of tips:
- Check that you are browsing the correct URL.
- Check that secure pages are actually secure.
- Check that the certificate is registered to the appropriate address.