U.K. lawmaker Amber Rudd blasted WhatsApp for using end-to-end encryption, preventing authorities from monitoring messages sent between people. It comes as news emerged that the London terrorist Khalid Masood sent a WhatsApp message only minutes before carrying out the attack. Now, British authorities must work with the messaging service in order to access Masood's messages. British Home Secretary Rudd told BBC. While police said they believe Masood acted alone,