What are significant challenges for intrusion detection systems?

The significant challenges for intrusion detection systems include issues related to compression and encryption. Intrusion detection systems (IDS) are designed to monitor network traffic and identify potential security incidents. When data is compressed or encrypted, it becomes harder for the IDS to analyze, as the system might not have the necessary keys to decrypt the information or may struggle to process highly compressed data efficiently. This can result in missed alerts for actual threats or an increase in false positives, compromising the overall effectiveness of the system.

The other options, while they do present challenges, do not directly address the specific technical limitations that compression and encryption impose on the functionality of intrusion detection systems. For example, high costs and user training can certainly be factors in deploying IDS, but they are not inherent challenges related to the core function of the systems themselves. Similarly, complex configurations and lack of support may hinder the implementation or maintenance of an IDS but do not specifically tie back to the operational challenges presented by data compression and encryption. Limited network coverage can affect visibility but does not encompass the specific technical challenges posed by the nature of the data being analyzed.