It is proposed a method for managing public and private data input at a device, the device comprising: - a data-input peripheral; - an open environment, - a secure environment, - a controller connected to the data-input peripheral, and the method comprises the steps of: - receiving at the controller data input at the data-input peripheral, - determining at the controller whether received data comprises private data, - if received data comprises private data, causing the controller to provide the secured environment with a secured access to the private data, the controller causing the secure environment to access the private data by sending operative data to the secure environment via the open environment. This method enables to send both operative and public data to the open environment with a minimum risk from the security point of view.