«’If you build a system where everything comes down to trusting the server, you might as well dispense with all the complexity and forget about end-to-end encryption,’ says Matthew Green, a cryptography professor at Johns Hopkins University who reviewed the Ruhr University researchers’ work. ‘It’s just a total screwup. There’s no excuse.’»

Source : WhatsApp Encryption Security Flaws Could Allow Snoops to Slide Into Group Chats | WIRED