Every time the point is raised that this just opens the door for mass surveillance of all private communications we just get vague assurances of "no it won't" like this from the article:

>whilst the privacy considerations that this type of technology raises must not be disregarded, we have presented arguments that suggest that it should be possible to deploy in configurations that mitigate many of the more serious privacy concerns

Which if you parse the language you realize he's saying no such technology exists, or is proven to work, but it might be possible to only violate most of your privacy as long as the government doesn't deem it to be 'serious'.