New safe way of visualizing public keys as QR-code and capturing them with camera is available in version 2.0. This solves the problem of transfering public key between devices without putting them on the internet. Now you can visualize your public key on one device and capture it with camera on another. The imported public key appears as 'Verified' and can be used for encrypting straight away. THe QR-code is also encrypted with password and this password is transferred (NOT the public key) through the server, so you still need internet connection to use QR-codes.