We will cover our take on mobile app security from basic methods to advanced. While developing our encrypted communication app Biocoded we had to be paranoid about our security. During this talk we will share some of the methods we employed to ensure top-to-bottom security. At the beginning we will look at standard principles of protecting the application and it’s data. Then we will move on to the advanced stuff such as encrypted signatures, forgery protection, distributed keys for data protection and end-to-end data encryption.