Bismillah (993337) writes Yahoo is working on an easy to use PGP interface for webmail, the company's chief information security officer Alex Stamos said at Black Hat 2014. This could lead to some interesting standoffs with governments and law enforcement wanting to read people's messages. From the article: "'We are working to design a key server architecture that allows for automatic discovery of public keys within Yahoo.com and other participating mail providers and to integrate encryption into the normal mail flow,' Stamos said."
Computers are unreliable, but humans are even more unreliable.
Any system which depends on human reliability is unreliable.