An Intrusion Detection System (IDS) monitors network traffic or system activities for malicious behavior or policy violations. It works by analyzing data packets, logs, or system calls to identify suspicious patterns or known attack signatures.
There are two main types of IDS:
- Network-based IDS (NIDS): Monitors network traffic by analyzing packets passing through a specific segment. For example, it can detect port scans or Distributed Denial-of-Service (DDoS) attacks.
- Host-based IDS (HIDS): Monitors individual devices by checking system logs, file integrity, and processes. For instance, it can detect unauthorized file changes or malware infections.
IDS uses two detection methods:
- Signature-based detection: Matches traffic against a database of known attack patterns (e.g., SQL injection attempts).
- Anomaly-based detection: Identifies deviations from normal behavior, such as unusual login times or data transfer volumes.
For cloud environments, Tencent Cloud offers Host Security (CWP) and Network Security (T-Sec-NIPS) services, which provide IDS capabilities to detect and respond to threats in real time. These services help safeguard cloud servers and networks from intrusions.