The idea behind the Internet of Things (IoT) is that everyday objects can connect to each other and exchange data via the Internet. Even the smallest components, such as sensors for measuring temperature, angle of inclination or acceleration can send information or accept commands via the network. Current and future systems are based on the Internet protocol and will probably soon include ipv6 support. They transmit data in an open and well-known format. Depending on the application, data will most likely be transmitted via public networks. This means that data is in principle open to everyone who is connected to the network. Subject to the type of data the consequences range from unpleasant to catastrophic, which is why confidentiality must be protected and safeguarded. There are many ways of achieving this, especially through encryption.