A browser plugin is really really obvious, whereas if you take a look at the CA's in firefox - there's hundreds. All you need is one subtly different from what'

A browser plugin is really really obvious, whereas if you take a look at the CA's in firefox - there's hundreds. All you need is one subtly different from what's expected - barely noticeable. https://www.bluecoat.com/products/proxysg https://www.bluecoat.com/products/proxysg I think you'll find the above product interesting. Apparently anti-virus vendors have similar programs - to prevent malware being downloaded over https behind a corporate proxy. It seems that CDN's such as cloudflare and akamai take the websites SSL _private_ keys too. http://blog.cloudflare.com/introducing-strict-ssl-protecting-against-a-man-in-the-middle-attack-on-origin-traffic http://blog.cloudflare.com/introducing-strict-ssl-protecting... This blog post is a fancy way of saying that cloudflare content serving customers now have the option of encrypting the link between cloudflare and them. Note that users can still be MITM'd at the cloudflare site - even with the new arragement.