
ISO/IEC 27018: Guidelines for Protecting PII in Public Clouds
ISO/IEC 27018 is the first international standard specifically designed to protect personally identifiable information (PII) in public cloud environments, acting as a specialized privacy extension to the foundational ISO/IEC 27001 Information Security Management System (ISMS). Tailored uniquely for cloud service providers (CSPs) acting as contractual PII processors, it translates the eleven privacy principles of ISO/IEC 29100 into concrete, cloud-native operational controls. The standard establishes strict technical and organizational accountability throughout the cloud data lifecycle, enforcing robust mechanisms for sub-processor transparency, geographical data residency disclosures, granular access controls, and automated tenant data purging. The standard's 2025 third edition modernized this framework, abandoning the legacy 18-section format of the 2019 version to align directly with the four-theme taxonomy—Organizational, People, Physical, and Technological controls—of ISO/IEC 27002:2022. While voluntary, implementing these guidelines provides a robust technical blueprint that helps cloud processors demonstrate compliance with prescriptive, legally binding regulations such as GDPR Article 28.


















