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Can I use ECDSA certificates? #1716
I know it may be a bit out of place here, but I'd really like to know what browsers I'd be leaving behind if i were to deploy an ECDSA-only HTTPS site.
A cursory glance in SSLLabs  indicates I may be leaving some old versions of IE behind. However, their browser repository is neither as complete nor as accessible as caniuse.com.
referenced this issue
Apr 20, 2017
Actually, in the two years since I submitted this issue I've learned that if it were up to browsers, everyone would switch to ECDSA yesterday. However, the bottleneck in this scenario are corporate firewalls that MitM (decrypt and re-encrypt) all network traffic. If those devices aren't aware of ECDSA, the connection fails regardless of browser version. This is much harder to measure, unfortunately.
If we include it in this list one could get the false sense of security that an ECDSA-only site can be reached by ~98% of all browsers, but in reality, depending on your target audience, you're only available to e.g. ~70% of your customers.