The ApsaraDB for Lindorm (Lindorm) time series engine service that is called Lindorm TSDB does not provide an identity authentication system or a resource access management (RAM) system. Therefore, Lindorm TSDB does not verify the identity of the user who calls the API operations to write and read data. However, Lindorm TSDB supports virtual private clouds (VPCs) on Alibaba Cloud. You can deploy your Lindorm instance in a VPC to isolate and secure your data. Lindorm TSDB also allows you to configure an IP address whitelist for your Lindorm instance to ensure fine-grained data security.