Table of Contents
Securing data in the cloud has become a priority for all organizations, whether they are companies, administrations, or structures handling sensitive information. In France, the SecNumCloud, a framework established by ANSSI, defines the rules and best practices to follow to ensure a high level of security on cloud services.
Knowing these requirements is not just an administrative formality. It helps avoid major breaches, protect critical data, and demonstrate to partners or clients that information is handled in a secure environment.
The SecNumCloud is based on a series of criteria that providers must meet to obtain qualification. These criteria cover different aspects of security, but some are essential to understand:
• Secure data hosting: information must remain on French or European territory and be isolated from unsecured environments.
• Access control: rights must be clearly defined and regularly audited to prevent any intrusion.
• Traceability of operations: every action on the data must be recorded to detect anomalies or incidents.
These points ensure that the provider is capable of guaranteeing a level of protection in line with ANSSI’s requirements.
One of the crucial aspects of SecNumCloud is identity and access rights management. This involves:
• precisely identifying users and their privileges
• implementing strong authentication, for example through multi-factor authentication
• limiting rights to only the actions necessary for the activity
Rigorous identity management significantly reduces the risk of data leakage or unauthorized access.
The SecNumCloud also requires that data be protected end-to-end. This means:
• encryption of data at rest, so that files remain unreadable even in case of unauthorized server access
• encryption of data in transit, to secure exchanges between the client and the cloud
• regular rotation of encryption keys to limit risks in case of compromise
These measures ensure that information remains confidential and protected against any interception.
A secure cloud is not limited to data protection. The SecNumCloud requires that the service:
• has reliable backup and restoration procedures
• can continue to operate even in the event of a major incident
• implements disaster recovery plans and regular tests
These measures help minimize interruptions and protect data against accidental or malicious losses.
To obtain SecNumCloud qualification, providers must undergo regular audits. These checks focus on:
• compliance with technical and organizational requirements
• implementation of operational security measures
• documentation and traceability of all security actions
A successful audit demonstrates that the provider meets a recognized standard and provides a solid basis for customer trust.
An often underestimated aspect is the ability to quickly detect incidents. SecNumCloud recommends:
• implementing monitoring systems to identify abnormal behaviors
• immediate alert procedures in case of compromise
• the ability to quickly correct detected vulnerabilities
Proactive monitoring allows for a response before problems affect critical data or service continuity.
The SecNumCloud requires that certain data be hosted on national territory or in areas considered safe by ANSSI. This requirement:
• facilitates control by French authorities
• limits risks related to foreign jurisdictions
• reassures clients about the security and confidentiality of their information
For companies handling sensitive data, this point is strategic for compliance with regulations.
Even though obtaining SecNumCloud qualification is the responsibility of cloud providers, client companies can prepare by:
• choosing providers already certified or qualified
• clearly defining confidentiality levels and security requirements
• regularly auditing their internal practices and access to cloud services
This preparation reduces risks and facilitates compliance with ANSSI standards.