I. Introduction
Nowadays, the Web provides access to a lot of online services while users expect privacy protection when accessing them. Indeed, recent public scandals about mass surveillance have raised people awareness and expectation regarding privacy concerns. As a result, the number of Web services protected by encryption with HTTPS [1] has hugely increased in the last years, as proven by the percentage of pages loaded through HTTPS (in the USA) for Chrome and Firefox, with respectively an increase of 38% and 26% to reach the current proportion of 88% and 84%.
https://en.wikipedia.org/wiki/Golden_Shield_Project, https://en.wikipedia.org/wiki/PRISM_(surveillance_program)
https://transparencyreport.google.com/https/overview?hl=en
https://letsencrypt.org/stats/-percent-pageloads, accessed on 06/28/2019.