This paper explains how ISO/IEC 27001 and ISO/IEC 27017 provide a framework for securing cloud-based APIs through a comprehensive information security management system. The standards address the unique risks of cloud environments, including data residency, shared responsibility, and public exposure of APIs, while emphasizing policies, governance, and continuous review. They recommend technical controls such as TLS encryption for data in transit, strong authentication using OAuth 2.0 and JWT, and logging and monitoring of API activity to detect incidents. By aligning API security with organizational governance and cloud-specific controls, these standards help organizations protect sensitive data, demonstrate compliance, and build customer and partner trust.

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