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The two companies account for a significant proportion of the world’s email traffic, and it would have been a big step towards Green’s vision, if Google hadn’t cancelled the project. In 2014, Google launched a project with Yahoo to bring end-to-end encryption to their email services. Green would like to see a world where we encrypt all of our communications, including email. They don’t think about the whole system.” Individually people think about the security of their own tool. “When something goes wrong in the amorphous PGP community, no one puts their hand up to fix it. “When something goes wrong with WhatsApp, WhatsApp fixes it,” he says. But, these projects are generally less vulnerable than PGP because they are independent, says Green. Of course, there are potential problems with allowing private companies to hold the keys to all of your sensitive conversations. It doesn’t matter how strong the chain of PGP is, if they can get you to unlock it and send that information to them it’s essentially worthless.” “That then becomes the weakest link in the chain. “There’s no standard way of implementing it, so a number of people have just done it wrong,” he says. In the case of EFail, the issue is not with the PGP protocol itself, but with the way it has been implemented, says Josh Boehm, founder and CEO of encrypted communications service, which offers private voice and video chat in a web browser.
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To make PGP easier to use, end users can install plug-ins for their email clients, or use browser-based solutions to encrypt and decode their messages, but this is where vulnerabilities can creep in. Many of the issues around PGP are aligned with email being a dated form of communication. When he first reached out anonymously to a friend of Poitras, Micah Lee, to ask him for her public PGP key, he forgot to attach his own public key, meaning that Hill had no secure way to respond to him.
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“All of these things have been really hard for non-experts, and even for experts,” says Green.
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"There’s key management – you have to use it in your existing email client, and then you have to download keys, and then there’s this whole third issue of making sure they’re the right keys." It’s rumoured that the NSA stockpiles encrypted messages in the hope of gaining access to the keys at a later date.īut the biggest problem with PGP is how difficult it is for people to use simply. There are other faults, including the difficulty of accessing encrypted emails across multiple devices, and the issue of forward secrecy, which means that a breach potentially opens up all your past communication (unless you change your keys regularly). The science of cryptography has advanced dramatically since then, but PGP hasn’t, and any new implementations have to remain compatible with the features of previous tools, which can leave them vulnerable to similar exploits. It was first developed in 1991 (“when we didn’t really know anything about crypto”) and then standardised into OpenPGP from 1997. One of the many problems with PGP is its age, says Green.