C5 versus ISO27001

C5 versus ISO 27001

When it comes to information security, companies often come across two central standards: the C5 catalog (Cloud Computing Compliance Criteria Catalogue) and the international standard ISO 27001. Both frameworks have established themselves as important points of reference in recent years. But how do they relate to each other? Are they competitors or do they complement each other?

What is C5?

The C5 catalog was developed by the German Federal Office for Information Security (BSI) and is aimed specifically at cloud service providers. The aim is to ensure transparency and security in cloud use. C5 defines requirements that go beyond traditional security measures and focus on cloud-specific risks. These include, among others:

• Requirements for the physical security of data centers
• Regulations on data localization and access control
• Specifications for logging and traceability of activities
• Measures to protect against cyber attacks and data loss

C5 is particularly relevant for the German market, as it clearly defines the expectations of companies and authorities towards cloud service providers. Anyone operating as a provider or user of cloud services in Germany can hardly avoid C5.

ISO 27001 – The international standard

ISO 27001 is the globally recognized standard for information security management systems (ISMS). It defines requirements for how companies can systematically plan, implement and continuously improve their information security. The focus is not only on technical measures, but also on organizational processes. The core elements are

• Risk management: identification, assessment and treatment of risks
• Security policies and procedures
• Training and sensitization of employees
• Regular audits and improvement processes

ISO 27001 can be used across all industries and provides companies with a solid basis for taking a holistic approach to information security. ISO 27001 certification signals to customers and partners worldwide that a company takes information security seriously.

Competition or complement?

The short answer: C5 and ISO 27001 should not be seen as opponents. Rather, they complement each other. While ISO 27001 offers a comprehensive management system for information security, C5 addresses specific requirements for cloud services. Companies that implement both standards benefit from double protection:

• C5 ensures transparency and security in the cloud, which is particularly important for providers and users of cloud services.
• ISO 27001 creates a holistic security structure that encompasses all areas of the company.

Especially at a time when cloud solutions are increasingly becoming the standard, the combination of both approaches makes sense. It makes it possible to meet both international requirements and local specifics.

Advantages of the combination

The parallel implementation of C5 and ISO 27001 offers numerous advantages:

1. Increased trustworthiness: Customers and partners see that the company meets both global standards and national requirements.
2. Risk minimization: The combination allows risks to be viewed and treated from different perspectives.
3. Market access: C5 is often a prerequisite for cloud providers to do business in Germany. ISO 27001 opens doors to international markets.
4. Efficiency: Many requirements overlap. Those who integrate both standards can utilize synergies and avoid duplication of work.

Challenges during implementation

Of course, the implementation of both standards also brings challenges. These include:

• Complexity: The requirements are extensive and require careful planning.
• Resources: Time, budget and expertise must be provided.
• Continuous maintenance: Both C5 and ISO 27001 require regular reviews and adjustments.

Here it is important to choose a structured approach and, if necessary, to call in external expertise.

How Syngenity® GmbH supports

At Syngenity® GmbH, we support companies on their path to compliance with C5 and ISO 27001. Our approach includes:

• Gap analyses: We identify which requirements are already fulfilled and where there is a need for action.
• Consulting and implementation: From strategy development to practical implementation.
• Training: We sensitize employees to the importance of information security.
• Audit preparation: We help you to prepare optimally for external audits.

Our aim is not only to support companies in meeting standards, but also to establish a sustainable safety culture.

Conclusion

C5 and ISO 27001 are not competing frameworks, but two sides of the same coin. Those who use both standards create a robust foundation for information security – both in the cloud and throughout the company. In a digital world where trust and security are crucial, this dual approach pays off.