Alibaba Cloud Certified Associate (ACA) 2025 – 400 Free Practice Questions to Pass the Exam

Alibaba Cloud ensures safe calling of STS (Security Token Service) APIs by authenticating requests through signatures. This process involves generating a unique signature for each request, which is based on several parameters such as the request's contents, the access credentials, and a timestamp. This signature is used to verify the integrity and authenticity of the request, ensuring that it truly comes from a legitimate user or application.

Authentication via signatures is a crucial security measure because it prevents unauthorized access to the APIs. If a request is tampered with, the signature will be invalid, leading to a rejection of the request. This helps maintain the confidentiality and integrity of data when using STS APIs for temporary security credentials.

While applying machine learning for anomaly detection and user training are beneficial practices for enhancing overall security, they do not specifically address the direct authentication process for STS APIs. Limiting the number of API calls can help mitigate abuse and reduce the risk of denial-of-service attacks but does not ensure that the requests themselves are legitimate or secure. Therefore, authenticating requests via signatures is essential for ensuring safe API usage.