Abstract: The present disclosure relates to a microcontroller comprising a memory module for storing a digital certificate, a network module for establishing a connection with a network, and a processor. The processor is configured to establish a connection with a network computer located in the network, to request a digital certificate from the network computer, to receive the digital certificate from the network computer, to store the digital certificate in the memory module, and to exchange user data with the network computer, provided that a previous verification of the digital certificate of the microcontroller has been successful. The present disclosure further relates to a method for communication between a microcontroller and a network computer as well as to a network computer and a communication system.