Digital Sovereignty and the Cloud: Practical IT Strategies

Digital sovereignty: definition and strategic challenges

What is digital sovereignty?

Digital sovereignty refers to the ability of a state or organization to control its data, its digital infrastructures and its technological choices. Be careful, however, that this control is exerted on four very distinct dimensions.

The most telling example remains the American Cloud Act (Clarifying Lawful Overseas Use of Data Act, 2018). This law allows American authorities to require access to data held by companies under American law, even if this data is physically stored in Europe, in a French datacenter.

Why has digital sovereignty become a critical issue?

First, on the map regulatory, the RGPD strictly regulates the transfer of personal data outside the European Union. Sectors such as healthcare (HDS), defense or finance add their own layers of requirements and in the event of non-compliance, fines can reach, in the most serious cases, up to 4% of annual global turnover.

Then, on the map geopolitical, tensions between the United States, China and Europe have revealed the fragility of excessive technological dependence. The Cloud Act, but also the FISA (Foreign Intelligence Surveillance Act) in the United States, raise extraterritoriality questions that CIOs can no longer ignore. The Schrems I and II cases successively invalidated the Safe Harbor and then the Privacy Shield. Since 2023, the Data Privacy Framework has been the framework currently in force, although it is still the subject of legal debate.

Finally, on the plan strategic, data has become a competitive asset. AI models, recommendation algorithms, customer data: all this represents assets that organizations have an interest in protecting. Europe has become aware of this delay with initiatives such as Gaia-X, a European project aimed at defining a framework of trust and interoperability in the cloud, or the Doctrine Cloud of the French State (2021), which requires the use of the trusted Cloud for sensitive government data.

The risks of a non-sovereign IT strategy

The risks are real but vary considerably, according to your sector and the nature of your data. It is just as counterproductive to dramatize them as to minimize them.

• The risks legal are the most immediate: access by foreign authorities to your data, conflicts of jurisdiction, impossibility of opposing a foreign legal request.
• The risks of continuity are less visible but just as serious: what happens if your main supplier is sanctioned, goes bankrupt, or decides to leave your market?
• The risks economical linked to vendor lock-in are chronic: technological dependence, prohibitive migration costs, price increases with no credible alternative.

The panorama of sovereignty solutions

Option 1 — The “pure” sovereign cloud (100% French or European)

National sovereign clouds (OVH cloud, Scaleway, 3DS OUTSCALE) are developed and operated by actors under European law, without American shareholders. They offer a total legal sovereignty : no Cloud Act, no American extraterritoriality, support for the European technology industry.

However, the reality is more nuanced. These actors, despite significant progress, still present a Lower maturity than American hyperscalers: less extensive catalog of services, smaller partner ecosystem, less advanced AI and analytics tools. The costs may also be higher for comparable services.

These solutions remain relevant for specific use cases such as: ultra-sensitive data, sovereign sectors, organizations subject to very strict regulations. However, these solutions are not a one-size-fits-all answer.

Option 2 — The “Cloud of Trust” (hyperscaler partnerships + French players)

The Trusted Cloud model is based on an elegant principle of using large hyperscaler technology (Azure, Google Cloud), but have it operated by a French partner with an ANSSI qualification (SecNum Cloud), which controls access to data and intervenes legally, or on an operator that is truly independent of extra-European jurisdictions. That's why compliance and safety by design are a prerequisite.

Two projects are emblematic of this model:

• Bleu, a project in progress aimed at offering Microsoft technologies in a French framework of trust, led by Capgemini and Orange.
• S3NS, developed by Thales with Google Cloud, which is part of a SecNum Cloud qualification trajectory. The French operator holds the encryption keys and assumes operational responsibility, creating a legal barrier to requests from foreign authorities.

In terms of benefits, the trusted cloud provides access to cutting-edge technologies with sovereign guarantees. On the downside, the costs can be significantly higher than a standard deployment, according to the regulatory and hosting constraints selected. Moreover, operational complexity is increasing and debates persist about the reality of legal immunity in certain borderline cases.

Option 3 — Hyperscalers with European guarantees (Azure, AWS, GCP)

Microsoft has invested heavily to address European concerns. Azure has datacenters in France (France Central regions in Île-de-France and France South in France South in the south of France), with contractual commitments to reside data on European territory. THE EU Data Boundary, announced by Microsoft, aims to strengthen the residency of European customer data in Europe, including for certain support and operational processing, depending on the services concerned.

On a technical level, Azure offers concrete control mechanisms: Customer Lockbox (you validate or refuse each request for access to your data from Microsoft Support), BYOK (Bring Your Own Key, to maintain control of your encryption keys), and Azure Policy to enforce compliance policies across all of your resources.

However, it should be taken into account that: Microsoft remains a company under American law, and therefore subject to the Cloud Act mentioned above. But for the vast majority of non-ultra-sensitive use cases, this risk is residual and manageable.

Option 4 — The strategic hybrid and multi-cloud cloud

The most pragmatic approach for most large organizations: differentiate by data sensitivity level.

Ultra-sensitive data and workloads (strategic R&D, defense data, critical contractual information) are hosted on-premise or on the sovereign cloud. Common business applications, collaboration, productivity tools transit over hyperscalers with European guarantees. Azure Arc allows unified governance and management across this heterogeneous architecture.

This approach optimizes the triptych sovereignty-performance-cost. However, it is demanding: it requires multiple skills, rigorous governance and a well-thought-out architecture from the start.

Microsoft Azure and digital sovereignty: guarantees and limits

Microsoft commitments to European sovereignty

Azure has numerous international certifications (ISO 27001, SOC 2) and, for some services and regions, certifications such as HDS. In addition, Microsoft has made structuring commitments for the European market. The EU Data Boundary is a direct response to post-Schrems concerns: Microsoft is committed to strengthening the data residency of European customers in Europe.

As a reminder, Trusted Cloud partnerships (Blue in particular) illustrate Microsoft's desire to adapt to the requirements of French sovereignty, by offering an operational model compatible with State doctrine.

Technical guarantees of sovereignty on Azure

Several technical mechanisms make it possible to concretely strengthen the control of your data on Azure.

The encryption applies to data at rest and in transit, with the option of bringing your own keys (BYOK via Azure Key Vault) or using customer-managed keys (CMK). Customer Lockbox gives organizations a veto over support access. Azure Policy makes it possible to automatically impose compliance rules. For example, ban all deployment outside European regions. Finally, complete logs via Azure Monitor and Microsoft Sentinel ensure the auditability of all operations.

The limits you need to know: be honest about the constraints

Microsoft remains, as has been said, an American company and its commitments are contract workers. For national defense data, critical operators with the most stringent requirements, or organizations where residual risk is unacceptable, Azure is not a one-size-fits-all solution.

In addition, the Vendor Lock-In remains a potential pitfall. That is why migrating an Azure infrastructure to another provider is a considerable effort, even if portability tools exist. A well-designed multi-cloud strategy mitigates this risk, but does not eliminate it.

Mistakes to avoid in your sovereignty strategy

Confusing sovereignty and geographic location

This is the most common mistake. Sovereignty is at stake legal status of the operator, the subcontracting chain (support, maintenance, access to systems) and contracts, not on the latitude and longitude of the machines.

Beware of promises of “sovereign cloud” that are not based on a recognized qualification (SecNum Cloud from ANSSI, for example) or on an operator that is truly independent of extra-European jurisdictions.

Adopting a dogmatic approach (all or nothing)

Cutting yourself off American hyperscalers by principle costs a lot in terms of innovation, agility and available skills. On the other hand, entrusting all of its data assets to a single foreign supplier without risk analysis is negligent.

The right sovereignty strategy is one that is calibrated to your real challenges : sector of activity, nature of data, regulatory constraints, risk tolerance, operational capacity. It is never ideologically pure; it is pragmatically adapted.

Neglecting the economic and operational dimension

Sovereignty comes at a cost. Pure sovereign cloud or trusted cloud solutions can be significantly higher than a standard deployment, depending on the regulatory and hosting constraints selected. The architectures hybrids multi-cloud, although flexible, requires rare skills and rigorous governance, which represents a significant operational investment.

A sovereignty strategy that ignores the Total Cost of Ownership (TCO) and operational constraints result either in rapid abandonment or in technical debt whose cost greatly exceeds the expected benefits. Arbitration must incorporate, from the outset, a realistic assessment of the human, financial and organizational resources required.

Digital sovereignty effectively redefines IT strategies, but it does not require a choice between security and innovation. It requires differentiating, analyzing and arbitrating lucidly. This work requires expertise at the crossroads of technical, legal and strategic aspects.

Need to clarify your sovereignty strategy? Askware helps you map your risks, identify the level of protection adapted to each type of data and build an IT architecture that protects your interests without limiting your capacity for innovation. Request your sovereignty audit.