India’s high speed internet roll-out is not just a faster mobile signal, but a major overhaul of how networks are built and run. Beyond new radio towers and spectrum, high speed internet roll-out depends on widespread fibre backhaul, distributed edge computing, and highly automated operations. This shift moves data traffic from wireless links to software-driven control systems. To keep up with this technological evolution, the cybersecurity conversation must widen. Traditionally, concerns centred on the radio air interface, which controls the antennas and the spectrum. Today, threats can also come from tapped or damaged fibre, compromised network management systems, software bugs in edge platforms, or supply chain problems with vendors and equipment. Operational resilience, that is, how quickly networks can detect, isolate and recover from faults or attacks, becomes as important as protecting the airwaves.

Protecting national communications now requires securing physical fibre networks, hardening software and orchestration systems, reducing risky vendor dependencies, and building robust incident response frameworks, not just policing the radio link.

Shifting cybersecurity paradigm

India’s cybersecurity stance in telecom has shifted decisively from a radio-centric approach to a fibre-and-wired-infrastructure-first paradigm, with 5G and early-6G deployment reinforcing the centrality of fixed transport, data interconnect, and edge-based wired systems.

The countrywide roll-out of optic fibre backbone, aimed at “50 lakh km” of fibre and 100 per cent village-level wired connectivity, has made fiberised backhaul, inter-data centre links and wireline-edge nodes critical attack surfaces that now sit at the core of national security planning. Policymakers increasingly treat fibre and fixed access networks as the digital backbone of 5G-enabled services, embedding security-by-design in optical core and metro aggregation layers, mandating stringent certification for transmission and edge hardware vendors, and strengthening monitoring of interoperator fibre-based interconnects and data aggregation platforms.

A major 2024 telecom data breach underscored the risks in centralised wired databases and signalling-over-fibre systems, prompting the Department of Telecommunications to scale wired fraud intervention tools such as the Digital Intelligence Platform and Sanchar Saathi-linked blocking mechanisms that operate at the network and backbone level.

Looking ahead, the “Bharat 6G Vision” positions fibre and fixed access as the foundational layer of next-generation connectivity, with zero-trust-style segmentation, secure multitenancy over fibre aggregated edge and core, and resilient wired backbone standards central to India’s effort to shape global norms on wired infrastructure security in the 6G era.

Ensuring end-to-end security

A major trend is the move from “wireless-only” threat thinking to end-to-end security across radio access, transport fibre, cloud cores and edge nodes. 5G security features such as authentication, encryption and network isolation are built in, but they do not eliminate risks from misconfiguration, compromised vendors, or weak operations and maintenance practices.

On the technology side, quantum-secure communications are moving from concept to demonstration in India. STL and C-DOT reported the country’s first quantum key distribution (QKD) transmission over 100 km on multicore fibre, showing how QKD can coexist with high-capacity classical traffic in separate fibre cores. The Defence Research and Development Organisation (DRDO) and the Indian Institute of Technology (IIT) Delhi also demonstrated quantum-entanglement-based secure communication over a free space link, which is an important milestone because it means quantum-safe approaches are no longer limited to just academic theory.

For telecom operators, the next frontier is securing not just the fibre itself, but the operational layer around it. This involves monitoring latency, jitter, congestion, optical faults and unusual traffic patterns in near-real time. It matters because a backhaul outage or silent degradation can be as damaging as a direct cyberattack, especially in ultra-low-latency 5G use cases.

Why fibre matters

Fibre backhaul is often treated as “just transport”, but it is actually the core of any broadband network. If backhaul links are disrupted, tampered with, or poorly maintained, the impact can cascade into hospitals, ports, emergency response, industrial automation and defence communications.

Fibre is the backbone of 5G because it carries the traffic between towers, edge sites and core networks that make high speed, low-latency service possible. Without dense and reliable fibre backhaul, 5G speeds and responsiveness cannot be sustained, especially for applications such as industrial automation, remote operations, smart grids and real-time video services.

Its importance goes beyond capacity. Fibre affects uptime, network stability and quality of service, so problems such as cuts, poor maintenance, congestion, or weak route diversity can disrupt whole clusters of connected services. In this sense, fibre is not just a transport layer, but a critical dependency for the digital economy.

Fibre also matters because it changes the security profile of telecom networks. As more intelligence moves into cloud cores, edge computing and software-defined network management, the transport layer becomes a strategic target for outages, interception attempts and operational failures. That makes fibre resilience, monitoring and trusted vendor ecosystems essential parts of broadband security planning.

The risk is not only physical cable cutting. It also includes interception at splice points, equipment compromise in optical transport gear, cloud-controller exposure, vendor-locked management stacks and service degradation from jitter or packet timing instability that can affect quality of service commitments. In a 5G architecture, these failures can propagate quickly because traffic is more centralised, software-managed and latency-sensitive than in older networks.

Turning policy into a resilient security regime

India’s telecom security model currently relies on licensing conditions, equipment certification, trusted-source procurement and centralised monitoring rather than a single standalone 5G security law. The government requires telecom service providers to be responsible for securing their own networks, while the state enforces audit, certification and trusted-product requirements.

The Trusted Telecom Framework and the Indian Telecom Security Assurance Requirements (ITSAR) standards are focused on the issue because they try to reduce vendor risk exposure before deployment, not after an incident. The government has also expanded 5G use-case labs and innovation programmes to support adoption, which is useful for growth but increases the need for stronger security-by-design discipline as new sectors connect to a broader and expanding 5G infrastructure.

India has taken several meaningful steps, but it falls short of a fully integrated security and resilience framework for 5G and fibre backhaul. The gap is that policy has advanced faster on equipment trust and roll-out promotion than on the broader operational security of the fibre spine, maintenance practices, and long-term resilience.

On the upside, the government and regulators are promoting fiberisation, 5G ecosystem planning and cross-sector coordination. The Telecom Regulatory Authority of India (TRAI) has stated that adequate infrastructure upgradation and fiberisation are necessary to realise 5G’s benefits. The Department of Telecommunications has also implemented right-of-way rules and other roll-out-enabling measures, which matter because without faster fibre deployment, neither coverage nor backhaul resilience can improve at scale. These steps are useful because they address one of the country’s main bottlenecks – a network cannot be secure if the underlying transport layer remains underbuilt.

The broader policy picture is, therefore, mixed – good progress on trusted telecom sourcing, consultation on the 5G ecosystem, and enabling infrastructure rules, but weaker clarity on how cybersecurity, telecom regulation and national security will be jointly enforced across the transport layer. In practical terms, India is better prepared than it was a few years ago, but not yet where it needs to be if the goal is to secure 5G end to end. The next step is to turn policy from roll-out support into a resilience regime that covers fibre, vendors, operations and incident response.

Blind spots remain

The biggest blind spot is that cybersecurity discussion often stays focused on radio threats, SIM frauds or app-layer abuse while underestimating transport network fragility. Fibre O&M failures can be mundane yet catastrophic. Issues such as poor splicing, maintenance outages, faulty optical gear, delayed fault detection and congested backhaul can all undermine service continuity.

Vendor lock-in is another strategic concern. If critical optical transport, management software, or 5G core components are concentrated in too few suppliers, the country may face higher geopolitical risks, higher switching costs and weaker bargaining power over patches, telemetry access and security updates.

Quantum-secure fibres are promising, but they are not a complete fix. QKD and related quantum-safe techniques help protect key exchange and future-proof high-value links, yet they still require trusted hardware, operational discipline and complementary post-quantum cryptography for scale.

Establishing security rules, a must for fibre

India should treat fibre backhaul as critical digital infrastructure with security rules comparable to power or transport networks. That means stricter resilience standards, route diversity, mandatory fault telemetry, independent audit of optical transport vendors and incident reporting requirements for major outages.

A practical next step is layered security, trusted procurement, encrypted management planes, segmentation, zero-trust access for operators, and continuous anomaly detection for latency and jitter. For high-security corridors and defence-adjacent use cases, India should expand trials of QKD, multi-core fibre and post-quantum cryptography, but deploy them where they add measurable value rather than as a blanket replacement.

India should treat broadband security as an infrastructure programme, not only a telecom programme. This means building resilience into fibre backhaul, core networks, and edge systems at the design stage, instead of adding controls after deployment. A major priority is to strengthen the transport layer. India will need more route diversity, better fault monitoring, faster recovery standards and stricter maintenance discipline.

The country also needs a stronger supply chain strategy. This includes trusted procurement, vendor diversification, firmware and software assurance, and tighter oversight of the companies that install, operate and update telecom equipment.

Another important move is to prepare for quantum-safe communications. As quantum-capable attacks become a longer-term concern, India should expand post-quantum cryptography, quantum key distribution trials and secure key management systems for critical links.

Policy coordination will matter just as much as technology. Telecom regulation, cybersecurity rules, industrial policy and national security planning should work together so that roll-out speed does not outpace assurance.

The larger policy challenge is alignment. Telecom regulation, cyberpolicy, national security, and industrial policy need to be coordinated so that 5G expansion does not outpace assurance. In short, India’s 5G future will be secure only if the country stops thinking of cybersecurity as a wireless problem and starts treating the fibre spine, vendor ecosystem and operations layer as the main battlefield.

Himanshu Tagore