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The Cloud Computing Compliance Criteria Catalogue (C5) is a security framework developed by Germany's Federal Office for Information Security (BSI) that establishes minimum requirements for secure cloud computing. First published in 2016 and revised in 2019, C5 provides an independent assessment mechanism rather than a certification, enabling transparent evaluation of cloud service security controls across areas including identity management, data protection, incident response, and operational resilience. The framework supports German regulatory requirements such as the German IT Security Act, with healthcare cloud services mandated to meet C5 criteria since July 2024.

C5 assessment types

C5 assessments, conducted by independent auditors, evaluate security controls either at a specific point in time (Type 1) or over an extended period (Type 2). These standardized reports provide transparency into Atlassian’s security practices and risk management, enabling organizations to systematically compare cloud providers and make informed decisions about cloud adoption and ongoing risk management.

Shared responsibility in compliance

C5 assessments follow a shared responsibility model where Atlassian provides comprehensive security controls and transparent reporting, while customers retain responsibility for analyzing assessment reports within their own risk management frameworks and determining alignment with their specific security requirements. We encourage customers to review C5 reports annually as part of their vendor risk assessment processes.

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