A new update to the Android version of WhatsApp includes an unexpected but pleasant surprise: end-to-end encryption that is enabled by default. The Facebook-owned chat app has partnered with Open Whisper Systems, and will be using software called TextSecure to encrypt WhatsApp messages. TextSecure software will allow users to send messages that cannot be decrypted by WhatsApp itself, even if law enforcement comes knocking with a warrant. Only text messages sent by WhatsApp users will be encrypted, and only on Android.”]