WhatsApp received a lot of praise in April for making a complete switch for its messaging system to the Signal Protocol from Open Whisper Systems, which features a number of cryptographic elements to ensure the privacy of any communication. It was doing so well, and then the company and its owner, Facebook, had to muck about.
The Electronic Frontier Foundation (EFF) explains in a recent post where it believes WhatsApp went wrong, both in choices made at the April launch and in the months since.
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