In a odd and surprising move, WhatsApp has just offered end-to-end encryption for all Android users. Relying on the Open Whisper System, and using open source code, WhatsApp just gave 500 million users totally encrypted messaging. The encrypted messages are accessed via the user’s device, using a key that only the account owner can access on the device. That means WhatsApp can’t access the messages, and neither can law enforcement. It’s not clear when an iOS version may be available.