The increasing digitisation of industry and of the machinery and devices used in it is evidence of the continuous ongoing development of former industrial processes. The benefits of networking cannot be denied – interaction between multinational locations, intelligent systems with self-diagnostics, self-maintenance and more, shorter response times when production conditions change, seamless integration of customers and suppliers into the value chain... Basically a commercially operated Internet of Things is being created for Industry 4.0. But has safety found its place there too?This connectivity, which is intended to make business and research easier, also entails greater risk. The other side of the coin is that new opportunities for attack are arising for operators of digital devices - and using an Internet connection as the linking method is risk number 1. Every device that has an IP address is a potential source of risk for the internal network and for Internet users. The consequences of compromised industrial equipment are much more far-reaching than those of hacked PCs. Hence higher security requirements are needed in an environment that cannot be more productive and sensitive. The Cyber Security Report just produced by Deutsche Telekom reveals that 90 percent of decision-makers in politics and commerce see IT security as the biggest challenge for the large-scale implementation of Industry 4.0.