ISO 27018 Certification – Protection of Personal Data in Public Cloud

What is ISO 27018 Certification?

ISO/IEC 27018 is the international standard for protecting personal data in public cloud environments, developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It provides guidance for protecting personally identifiable information (PII) in public cloud services, specifically when the cloud service provider acts as a PII processor.

The standard establishes commonly accepted control objectives, controls and guidelines for implementing measures to protect PII in line with the privacy principles in ISO/IEC 29100 for the public cloud computing environment. These principles include consent and choice, purpose legitimacy, data minimization, use and retention limitation, transparency, individual participation, accountability, and information security.

ISO 27018 Certification demonstrates that a cloud service provider handles customer personal data responsibly, transparently, and securely, and only in line with customer instructions. It gives cloud customers independent assurance that their data, and the personal data of their own customers and employees, is protected when stored and processed in the cloud

Why is ISO 27018 Certification Important?

When businesses move personal data to the cloud, they remain accountable for how that data is protected, even though it is processed by a third-party provider. Customers need confidence that their cloud provider will not misuse personal data, will keep it secure, will be transparent about where it is stored and who can access it, and will support them in meeting their privacy obligations.

ISO 27018 Certification provides that confidence. ISO/IEC 27018 helps cloud providers meet legal, contractual, and ethical obligations regarding PII. For cloud and SaaS companies, it has become an important trust signal when serving enterprise clients, especially those in regulated industries such as banking, healthcare, insurance, and government. It also simplifies vendor due diligence, as clients can rely on an internationally recognized framework instead of lengthy custom assessments.

ISO 27018 and Data Protection Laws

ISO 27018 supports compliance with global privacy and data protection laws by giving cloud providers a clear framework for handling personal data as processors. It helps cloud providers demonstrate alignment with obligations under laws such as the GDPR and India's Digital Personal Data Protection (DPDP) Act, particularly around processing on instructions, sub-processor transparency, breach notification, cross-border data transfers, and data return or deletion.

However,ISO 27018 Certification supports compliance but does not by itself guarantee legal compliance. Organizations should also review their specific legal obligations in each jurisdiction where they operate

PII Processor vs PII Controller in the Cloud

• FPII Controller: The organization that decides why and how personal data is processed. In a cloud context, this is usually the cloud customer, such as a business storing its customer or employee data in a cloud application.
• PII Processor: The organization that processes personal data on behalf of the controller. In a cloud context, this is usually the cloud service provider.

ISO 27018 focuses on the responsibilities of the cloud provider as a PII processor. This means the provider must process data only as instructed, support the controller in meeting its obligations, be transparent about how data is handled, and never use customer data for its own purposes without consent. Clear contracts between the cloud provider and customer are essential to define these roles and responsibilities

Key ISO 27018 Controls and Principles

ISO 27018 builds on ISO 27002 security controls and adds privacy-specific protections for personal data in the public cloud. Key areas include:

Processing on Customer Instructions: Personal data is processed only for purposes defined by the cloud customer under contract.

No Use for Marketing Without Consent: Customer personal data is not used for advertising or marketing without express consent.

Support for Individuals' Rights: Helping customers respond to requests to access, correct, or delete personal data.

Transparency on Sub-Processors: Disclosing the use of sub-processors to customers before personal data is processed by them.

Data Location Disclosure: Informing customers of the countries where personal data may be stored or processed.

Disclosure Requests: Notifying customers of legally binding requests for disclosure of personal data, unless prohibited.

Breach Notification: Promptly notifying customers of personal data breaches so they can meet their own obligations.

Return, Transfer, and Disposal: Securely returning or deleting personal data when a contract ends.

Encryption: Protecting personal data transmitted over public networks and, where appropriate, at rest.

Secure Disposal: Ensuring personal data is securely erased from storage and media when no longer needed.

Temporary Files: Managing and deleting temporary files containing personal data.

Access Control and User Management: Controlling, logging, and monitoring access to personal data.

Confidentiality Commitments: Ensuring staff with access to personal data are bound by confidentiality obligations.

Records and Accountability: Maintaining records that demonstrate how personal data has been handled.

ISO 27018 vs ISO 27017 vs ISO 27001 vs ISO 27701

Standard	Focus
ISO 27001	Information Security Management System (ISMS) for all information
ISO 27017	Cloud-specific security controls for providers and customers
ISO 27018	Protection of personal data in public cloud by PII processors
ISO 27701	Privacy Information Management System (PIMS) for controllers and processors

ISO 27018 extends ISO/IEC 27002 by adapting controls specifically for cloud-based PII processing, and it complements an ISO/IEC 27001-based ISMS. ISO 27017 covers the wider security side of cloud computing, while ISO 27701 provides a full privacy management system. Many cloud providers implement these standards together for complete security and privacy assurance, with shared policies, risk processes, and combined audits reducing duplication.

How ISO 27018 Certification Works

Since ISO 27018 builds on ISO 27001, certification is achieved by including ISO 27018 controls within the scope of your ISO 27001 ISMS. The typical process includes:

1.Initial Consultation and Cloud Assessment

Understand your cloud services, the personal data you process for customers, and your contractual obligations as a PII processor.

2. Define Scope

Define the ISMS scope to include public cloud services and related personal data processing activities.

3. Gap Analysis

Assess current practices against ISO 27001 requirements and ISO/IEC 27018:2025 guidance to identify gaps.

4. Data Mapping

Map how customer personal data flows through your cloud services, including storage locations, backups, and sub-processors.

5. Cloud Privacy Risk Assessment

Identify and evaluate risks to personal data, such as unauthorized access, unlawful disclosure, cross-border transfers, and sub-processor risks.

6. Documentation DevelopmentT

Update the Statement of Applicability, policies, procedures, customer contracts, and customer-facing privacy information to include ISO 27018 controls.

7. Implement PII Protection Controls

Implement controls for processing on instructions, sub-processor disclosure, breach notification, data return and deletion, encryption, and access control.

8. Internal Audit

Conduct internal audits covering ISO 27001 requirements and ISO 27018 controls.

9. Management Review

Top management reviews ISMS and privacy performance, risks, incidents, and improvement opportunities.

10. Certification Audit

An accredited certification body conducts Stage 1 and Stage 2 audits covering ISO 27001 and ISO 27018 controls. ISO 27018 Audit Services can help organizations prepare with confidence. On successful completion, your organization receives certification demonstrating alignment with ISO 27018.

Benefits of ISO 27018 Certification

Stronger Protection of Personal Data: Dedicated controls for personal data processed in the cloud.

Enhanced Customer Trust: Demonstrates that customer data is handled only as instructed and never misused..

Support for Privacy Law Compliance: Helps align with GDPR, DPDP Act, and other privacy regulations.

Competitive Advantage: Helps win enterprise and regulated-industry clients who require cloud privacy assurance.

Greater Transparency: Clear disclosure of data locations, sub-processors, and disclosure requests.

Faster Client Due Diligence: Simplifies vendor assessments and security questionnaires.

Reduced Risk of Data Breaches: Strengthens controls around access, encryption, and disposal.

Clear Accountability: Defines responsibilities between cloud provider and customer.

Integrated Compliance: Works seamlessly with ISO 27001, ISO 27017, and ISO 27701.

Who Needs ISO 27018 Certification?

ISO 27018 Certification is valuable for organizations that process personal data in public cloud environments on behalf of their customers, including:

• Public Cloud Service Providers (IaaS, PaaS, SaaS)
• Public Cloud Service Providers (IaaS, PaaS, SaaS)
• SaaS and Software Product Companies
• Data Centers and Hosting Providers
• Managed Service Providers (MSPs)
• HR, Payroll, and CRM Platform Providers
• Health-Tech and Telemedicine Platforms
• Fintech and Payment Platforms
• EdTech Platforms
• Email, Collaboration, and Communication Service Providers
• Marketing and Customer Engagement Platforms
• Customer Support and Ticketing Platforms



Why Choose TopCertifier for ISO 27018 Certification?

TopCertifier is a leading ISO consulting and certification service provider that helps cloud providers achieve ISO 27018 Certification efficiently and effectively. Our experienced consultants provide end-to-end support, including gap analysis, data mapping, cloud privacy risk assessment, contract and sub-processor review, documentation, control implementation, internal audits, and certification audit preparation

We help organizations align with the latest ISO/IEC 27018:2025 edition and integrate it seamlessly with ISO 27001, ISO 27017, and ISO 27701. With strong expertise in cloud security and privacy, TopCertifier delivers practical solutions tailored to your cloud services and customer obligations. Our proven methodology helps cloud providers strengthen data protection, simplify client due diligence, build lasting trust, and achieve certification with confidence.