Officials briefed on the Paris attacks tell CNN for the first time that investigators have found evidence they believe shows some of the terrorists used encrypted apps to hide plotting for the attacks. Officials found Whatsapp and Telegram apps, two companies that boast of end-to-end encryption that protects the privacy of their users and are difficult to decrypt. Previously, officials said they found encrypted apps on cell phones recovered from the crime scene, but they stopped short of saying they believed the apps were used in plotting the attacks. CNN has reached out to Whatsapp and Telegram for comment.