Method for Secure Communication Between a Field Device of Automation Technology and an End Device as well as a System for Secure Communication Between a Field Device and an End Device

A system for secure communication, comprising:

• a field device of automation technology;
• and
• an authentication server;
• wherein the field device has a cause-effect relationship with a physical process and the field device is configured to be connected to other field devices and/or a process control system;
• wherein the field device includes data processing electronics, wherein the field device is configured to be connected to an end device via an end device communication interface different from the field bus interface;
• and
• wherein the field device is connected to the authentication server via a server communication interface;
• wherein the data processing electronics is designed to receive an individual access code of the connected end device via the end communication interface;
• wherein the data processing electronics is designed to transmit the access code or an access code derived from the access code to the authentication server via the server communication interface;
• wherein authentication data is stored on the authentication server, on the basis of which the authenticity of the access code is checked on the authentication server;
• wherein the data processing electronics is designed to receive an authentication result determined by the authentication server via the server communication interface;
• and
• wherein the data processing electronics is designed such that it makes resources of the field device available to the end device depending on the received authentication result.