Zero Trust: Cross-Enterprise Collaboration 

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Zero Trust: A Business Case for Cross-Enterprise Collaboration 

In a connected economy, the ability to withstand disruption depends on how trust is managed.

European value chains span organisations, sectors and borders. Aviation, healthcare, energy and industry all operate as networks of independent actors who exchange data and execute joint processes in real time. While this collaboration is a source of growth, it also poses risks. Every new partner adds an entry point. Every long-standing certification represents an unhedged liability. The question for boards is no longer how to prevent disruption, but how to continue operating when it occurs. This is exactly where FACIS comes in.

From Assumption to Verification

The dominant security model treats internal environments as safe and partners as trusted by inheritance. Once access is granted, it persists far beyond the original context or need. This model has reached its limit. Zero Trust replaces static trust with continuous verification: “Never trust. Always verify.”
Identity, device security status, and context are evaluated on every request. Access is limited to the specific action required. Compromise of one component does not propagate to the others. Resilience becomes a property of architecture, not of perimeter defense.

However, Zero Trust should not be understood as a universal blueprintIts implementation depends on industry context, risk profile, legacy infrastructure, and operational constraints. Trust cannot be measured directly; it must be inferred through policies, verified credentials, contextual information, and continuous validation mechanisms. 

Trust Is Not Only an IT Topic, but a Monetary Business Risk

Implicit trust is a hidden source of business risk – but also a governance, liability, and accountability issue. A long-standing partner access, a permanently open VPN connection, a forgotten service account … these increase the risk of operational disruption, financial loss, and systemic risk. Zero Trust replaces permanent trust with continuous verification: every access decision is verified and logged, every entitlement is limited to a defined purpose and duration. The organizations that can govern digital trust as a measurable business risk will set the rules for the rest.

Contracts, liability frameworks, and ownership of risk remain essential. Zero Trust can strengthen digital trust, but it cannot replace legal accountability or contractual clarity. In practice, technical verification and traditional due diligence will continue to complement each other.

Trust cannot be measured directly; it must be inferred through policies, verified credentials, contextual information, and continuous validation mechanisms. 

Cross-Enterprise Speed Comes from Verifiable Trust, Not from Legal Contracts

Partner onboarding remains one of the main bottlenecks for new collaborations and revenue opportunities. Manual due diligence, certification audits, and contract negotiations take months. Verifiable Credentials and federated trust services can reduce the process from months to minutes by turning slow manual verification into an automated process based on trusted digital proofs. The speed advantage is not marginal. It changes which collaborations are economically viable.

Resilience Is Procured, Not Assumed

Traditional trust models fail catastrophically: one compromised credential exposes the entire system or partner network. In a Zero Trust architecture failures are local: a compromise affects only one identity, one workload, one operational segment. Operations can continue – provided that verification systems are designed with fallback mechanisms, graceful degradation, and clear procedures for connectivity or validation failures. This is not primarily a security capability, but a resilience capability. Organizations that procure for resilience will outperform those that optimise only for cost.

Implementation Reality: Hybrid Adoption

 In real-world environments, Zero Trust will often be introduced gradually. Aviation, public safety, defense, and other regulated sectors depend on legacy systems that were not designed for continuous verification. Full adoption may require redesign, investment, and new operational processes. For the foreseeable future, hybrid models will be necessary: combining established security and due diligence practices with digital identity, policy engines, and real-time verification where they create measurable value. 

The European Dimension

European initiatives such as 8ra and FACIS reflect a broader shift: digital cooperation can no longer be based on implicit trust between organizations. As European industries become more interconnected, resilience hinges on the capacity to collaborate securely across companies, sectors and borders. Zero Trust is emerging as a fundamental principle of these efforts, emphasising the need for continuous trust verification, limited and controllable access, and the prevention of disruption cascading through the wider ecosystem from one organization.

Traditional trust models fail catastrophically: one compromised credential exposes the entire system or partner network.

Beyond Zero Trust: The Digitalization of Trust

The aviation industry is currently navigating a complex “security vs. connectivity” dilemma. While the drive for digital transformation requires seamless data exchange, every connection point introduces a potential vector for cyberattacks. There are several areas to be considered. Modern aircraft must share real-time data with ground IT systems, maintenance crews, and air traffic control to optimize efficiency. Such interactions span various phases, from refueling and catering at the gate through to data sharing with service, maintenance, and travel partners for various use cases.

The Key Principles of Zero Trust

To understand how Zero Trust works, think of it through these three core pillars:

  1. Continuous Verification: Just because you logged in once doesn’t mean you remain trusted. The system constantly checks who you are, what device you are using, and whether your behavior looks normal.
  2. Least Privilege: Users are only given the bare minimum access they need to do their jobs. A baggage handler doesn’t need access to the flight navigation systems, and a gate agent doesn’t need access to payroll.
  3. Assume Breach: We design the system as if a hacker is already in the building. By segmenting data into small “rooms” with locked doors, we ensure that if a hacker gets into one room, they can’t easily move to the next.

Zero Trust in the Aviation Industry

The aviation ecosystem is incredibly complex, involving airlines, airports, ground handling, and government agencies. This makes aviation a valuable stress test for Zero Trust – but also a reminder that cybersecurity must align with safety regulation, certification requirements, and supply-chain trust.

  • Supply Chain & Third Parties: Airports rely on hundreds of external vendors (catering, fueling, cleaning). Zero Trust ensures that a vendor’s compromised laptop cannot gain access to the airport’s critical flight-scheduling systems.
  • Remote Maintenance & IoT: Modern aircraft are “flying data centers.” Mechanics often use tablets to run diagnostics on engines. Zero Trust ensures that the connection between the tablet and the aircraft is encrypted and verified, preventing “man-in-the-middle” attacks that could alter flight data and making sure that maintenance accesses are restricted to authorized personnel.
  • Passenger Privacy: With the rise of biometric boarding (facial recognition), airports handle sensitive personal data. Zero Trust protects this by ensuring that only specific, authorized applications can access biometric databases, and only for the few seconds required to verify a traveler.

European Resilience Summit This article is based on our Doc Read session held during the European Resilience Summit in Vienna. The original version, presented on  May 12, 2026, has been revised to reflect the comments and suggestions provided by session participants. The updated document is available for download here.

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