All messages in transit are SSL encrypted (256bit).
SSL (Secure Sockets Layer) is a standard security protocol for establishing encrypted links between a web server and a browser in an online communication. SSL technology ensures that all data transmitted between the web server and browser remains encrypted.
When a photo or video is sent to you from another user, you do not receive the photo or video with the message, you receive a link to the Crises Control cloud where you can view it.