# Key Management System GreenNode KMS helps users manage keys securely and efficiently. GreenNode supports users with two types of keys: * GreenNode Managed Key: Keys automatically created by GreenNode upon request when users utilize GreenNode services, completely free of charge. Users can only view the key details. * Customer Managed Key: Keys created or imported by users in GreenNode's KMS system. Users can change the status of the keys or delete them when they are no longer needed. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.vngcloud.vn/vng-cloud-document/key-management-system.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.