identyPASS can provide a fully mobile and secured token management system for end-point-authentication and transaction security. The token allows a remote multi-factor authentication of users and a verification of transactions over the internet without the need of any peripheral installation. An optical interface allows a one-way communication from a remote server directly into the token. Encrypted messages are transmitted by a server that generates a flickering code that is read by the optical interface of the token on any screen displays.