436 The State of the Art in Intrusion Prevention and Detection
not regarded as very important but expensive and sometimes completely unnecessary for automation
systems. Even in large companies, the existing security mechanisms can often be improved by well
thought out security management. In addition, the network logging is often poor, and backup strate-
gies are missing. Hence, belated analyses of attacks are difcult or impossible. The correction of these
issues or even the awareness of an existing problem can already improve the overall system security.
It is a matter of common knowledge that a system is as secure as its weakest point. That may be
a gateway or rewall, a PC within the ofce network, a wireless access point, a programmable ...