i'm not entirely sure this is worthy of a paper... its pretty much a common sense conclusion to reach if you've ever tried to use these things that the UX is usually terrible - even by the standards of a technical user.
too many manual efforts need to be made, even after setting up software that is purely designed to make this sort of thing easier.
mailvelope is a good example though - i've tried using it, but its not very clear what to do with it, and even once you get to the point of having the button appear in your gmail or whatever you have to then go and do even more things before you can actually send something that is encrypted. optimising this workflow should be trivial... a lot of this stuff can be done for you, e.g. by automatically enabling for common webmail sites, automatically generating some keys for you etc.
too many manual efforts need to be made, even after setting up software that is purely designed to make this sort of thing easier.
mailvelope is a good example though - i've tried using it, but its not very clear what to do with it, and even once you get to the point of having the button appear in your gmail or whatever you have to then go and do even more things before you can actually send something that is encrypted. optimising this workflow should be trivial... a lot of this stuff can be done for you, e.g. by automatically enabling for common webmail sites, automatically generating some keys for you etc.