When I access my https site with my self-cert SSL, the browser will give me red-cross and slash-mark on my browser address bar around https, why does it happen ? Whether do I have to or must buy trusted SSL cert instead of self-cert to disable the red cross-mark or slash-mark on https ?
For buying trusted SSL certificate, I have search all of it. there is really expensive or low-cost one ,for example some offer $600US/year and some offer $5US/year, why it is so much different in pricing if those company just use similar encrypt algorithm ?
I also find some Ad about some large hosting company provide Turbo SSL cert through Domain Control validation to cut down the certificate cost. What is it about ?