Resilience by Design: Removing time as a single point of failure
An AMS-IX Story
AMS-IX
When organisations think about resilience, they typically focus on redundancy. Backup power. Disaster recovery sites. Every critical service is designed to eliminate a single point of failure. Yet one of the most fundamental components of digital infrastructure is often overlooked: time.
Every authentication request, financial transaction, security event, database update and network operation depends on accurate, synchronised time. It is the invisible layer that keeps digital systems aligned and trustworthy. But for many organisations, this critical function ultimately relies on a single external source: Global Navigation Satellite Systems (GNSS), such as GPS.
As organisations become increasingly dependent on real-time digital services, the reliability of their time infrastructure has never been more important. At the same time, interference with GNSS signals, including GPS jamming and GPS spoofing, is becoming more common. Once largely associated with military operations, these attacks are now affecting civilian aviation, maritime transport and critical infrastructure, exposing just how vulnerable satellite-dependent systems can be.
The hidden vulnerability in modern infrastructure
GNSS has transformed time synchronisation. Since 1985, organisations have relied on it as the primary source for synchronising time across devices, networks and applications. Under normal conditions, GNSS provides highly accurate timing. The vulnerability lies not in the technology itself, but in relying on it as the only trusted time source. Because satellite signals are weak by the time they reach Earth, they are vulnerable to interference. If an attacker silently manipulates a GNSS signal, shifting an organisation's clocks by only a few milliseconds, the consequences can be significant:
- Security controls fail
Time-dependent authentication mechanisms, such as MFA tokens, TLS certificates and cryptographic keys, may expire too early or remain valid for too long, locking out legitimate users or creating opportunities for attackers.
- Forensic investigations become unreliable
During a ransomware attack or security incident, investigators rely on perfectly synchronised logs to reconstruct events and trace attacker activity. Even minor clock drift can break the timeline, delay incident response and making root-cause analysis far more difficult.
- Compliance risks increase
Regulations such as DORA, NIS2 and data protection laws require accurate audit trails and timely incident reporting. Without a trusted time source, organisations may struggle to prove when events occurred, increasing both regulatory and legal exposure.
The challenge is no longer simply maintaining system availability. It is ensuring the integrity of the time source that underpins security, operations and compliance. Treating GNSS as a single source of truth creates a hidden dependency, and a single point of failure.
Resilience requires independent paths
Modern digital infrastructure is built on the principle of redundancy. Organisations rarely depend on a single internet provider, one cloud region or one data centre. Critical services are distributed to ensure operations continue when one component fails. Time infrastructure deserves the same design philosophy.
Rather than replacing GNSS, organisations could complement it with an independent terrestrial timing source delivered over fibre and ground-based infrastructure. These are fundamentally different delivery paths. If satellite timing becomes unavailable due to jamming, spoofing or technical failure, terrestrial synchronisation continues providing trusted, highly accurate time without interrupting business operations.
This layered approach removes a hidden single point of failure and creates a far more resilient timing architecture.
Time has become a business and compliance issue
“Accurate time is no longer simply an IT concern”
Financial institutions rely on precise timestamps to comply with regulations such as MiFID II. Security teams depend on synchronised logs to reconstruct cyber incidents and prove compliance. Cloud-native applications require consistent timing across distributed environments, while manufacturers and logistics providers increasingly rely on accurate time to coordinate automated processes and supply chains.
Without trusted timestamps, organisations may struggle to demonstrate when transactions occurred, reconstruct security incidents or satisfy regulatory audits. Time has evolved from a technical utility into a business-critical asset that underpins operational continuity, regulatory compliance and digital trust.
Building resilience before disruption occurs
One of the defining characteristics of resilient organisations is that they prepare before incidents happen. Waiting until GNSS signals are disrupted is comparable to installing a secondary internet connection after the primary link has already failed. By then, the disruption has already impacted operations.
A resilient timing strategy combines multiple independent reference sources, continuous monitoring and automatic failover. Just as cybersecurity increasingly relies on defence-in-depth, resilient timing depends on diversity rather than dependence on a single technology.
This proactive approach ensures organisations can continue operating, even when one synchronisation path becomes unavailable.
From resilience strategy to resilient time
Building resilience is not just about recognising the importance of timing. It is about making resilient time available by design, without requiring every organisation to build, operate and maintain complex timing infrastructure itself. This is where Time-as-a-Service comes in.
Time-as-a-Service provides organisations with access to a secure, continuously monitored and resilient source of time, designed to complement existing synchronisation methods and create greater diversity in timing infrastructure.
Because the most resilient organisations don’t wait for disruption, they build continuity into the way they operate.
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