NSA whistle-blower Edward Snowden and noted hacker Andrew “Bunnie” Huang on Thursday published a paper on their collaboration to design a smartphone case that will protect user privacy. The pair developed a prototype compatible with the 4.7-inch iPhone 6, as it’s “driven primarily by what we understand to be the current preferences and tastes of reporters,” the paper states. “We assume any platform … can and will be compromised by state-level adversaries.”