For senior executives in the electronics and IoT industry, the timeline for quantum computing has shifted from “a distant theoretical concern” to “an imminent strategic risk.” The devices you design and deploy today will likely remain in the field for five, ten, or even fifteen years. In sectors such as smart metering, industrial control, automotive, and critical infrastructure, product lifecycles routinely span a decade or more.

The question facing every hardware decision maker is no longer whether quantum computers will break classical cryptography, but when. And when that day arrives, will your products still be secure?

This guide examines the imperative of post-quantum cryptography (PQC) for IoT devices, the practical strategies for implementation in resource-constrained embedded systems, and how Cionlabs can help you build quantum-resistant products today.

The Quantum Threat to Classical Cryptography

The cryptographic algorithms that secure today’s IoT devices, RSA and Elliptic Curve Cryptography (ECC), rely on mathematical problems that are computationally infeasible for classical computers to solve. However, quantum algorithms such as Shor’s algorithm can efficiently solve these problems, rendering RSA and ECC effectively useless.

The implications for IoT deployments are severe. A smart meter deployed today with a 10-year operational life could still be in the field when quantum computers reach sufficient scale. An automotive control unit designed now could remain on the road for 15 years. An industrial sensor network with a 20-year deployment horizon will almost certainly face a post-quantum threat environment.

The transition to PQC is not optional. It is a necessity driven by three converging forces:

Regulatory Mandates: The European Union and agencies such as ANSSI and BSI advocate for Post-Quantum/Traditional (PQ/T) hybrid cryptographic models. India’s own regulatory landscape is evolving, with initiatives like the proposed post-quantum semiconductor center in Gujarat signaling the government’s commitment to quantum-resistant technologies.

Customer Expectations: Enterprises deploying long-lived infrastructure are increasingly requiring quantum-resistant security assurances from their technology partners.

Competitive Differentiation: Early adoption of PQC provides a distinct market advantage, positioning your products as future-ready while competitors risk obsolescence.

The Embedded Challenge: PQC in Resource-Constrained Devices

Implementing PQC in IoT devices presents a fundamental engineering challenge. Embedded systems operate under severe constraints: limited CPU power, scarce RAM, restricted energy budgets, and minimal area for cryptography cores. Many PQC schemes demand significantly more memory, arithmetic complexity, and bandwidth than legacy ciphers.

This is not a theoretical concern. Research shows that PQC implementations must balance security strength against practical feasibility in constrained environments. However, recent advances have made PQC viable even in devices with tight resource budgets.

Breakthrough: PQC in 5KB of RAM

In March 2026, PQShield released a technical update to its PQMicroLib-Core library, achieving a memory footprint of less than 5KB of RAM. Unveiled at Embedded World 2026, this implementation targets memory-constrained embedded devices such as medical wearables, payment terminals, and industrial control systems. The library provides production-ready support for NIST-standardized algorithms, including ML-KEM (FIPS 203) and ML-DSA (FIPS 204), allowing post-quantum cryptography to operate within the 8-10KB RAM budgets typical of secure boot processes.

This breakthrough has profound implications. It means that even the most resource-constrained devices can now be equipped with quantum-resistant security without requiring hardware upgrades. The library includes integrated countermeasures against Differential Power Analysis (DPA) and fault injection, enabling side-channel resistance on devices lacking hardware-based cryptographic accelerators.

Software-Based Migration for Brownfield Devices

Perhaps most significantly, this software-based approach enables the migration of approximately 20 billion existing “brownfield” devices currently in the field to quantum-resistant standards without requiring hardware replacements. For organizations with substantial deployed bases, this represents a critical capability.

The NIST Standardization Landscape

The National Institute of Standards and Technology (NIST) has been leading the global effort to standardize PQC algorithms. In 2022, NIST selected four algorithms: ML-KEM (Kyber) for key encapsulation, and three digital signature schemes: ML-DSA (Dilithium), SLH-DSA (SPHINCS+), and FN-DSA (Falcon). In 2024, NIST concluded a fourth round of evaluation, ultimately choosing HQC, a code-based scheme, to complement the lattice-based Kyber.

The selection of multiple algorithm families reflects the recognition that no single approach is optimal for all use cases. Different PQC algorithm families offer different trade-offs:

Algorithm Family	Strengths	Challenges for Embedded Devices
Lattice-based (ML-KEM, ML-DSA)	Balanced security, reasonable key sizes, moderate performance	Heavier polynomial arithmetic, memory overhead
Code-based (HQC, Classic McEliece)	Historically strong security margins	Very large key sizes, bandwidth usage
Hash-based (SLH-DSA)	Simple primitives, scalable security	Large signature sizes, high computational cost

For embedded systems, ML-KEM strikes the best balance between performance and footprint, while algorithms like HQC offer advantages in storage-constrained scenarios due to smaller secret key sizes.

Hybrid Cryptography: The Pragmatic Path Forward

For organizations building long-lived IoT deployments today, a purely PQC-based approach carries risks. PQC standards are still maturing, and adopting a scheme that later becomes obsolete could prove costly. The pragmatic solution is hybrid cryptography.

The hybrid approach combines classical cryptography with PQC, ensuring that compromising one algorithm does not compromise the security of the session key. The QUBIP project, funded by the European Union, has demonstrated a practical implementation of hybrid cryptography on resource-constrained embedded devices, enhancing the Mbed-TLS protocol stack to support PQ/T hybrid communication.

Key elements of hybrid cryptography include:

Hybrid Key Exchange: Combining classical X25519 (Elliptic Curve Diffie-Hellman) with ML-KEM-768 (Kyber) ensures security even if one algorithm is broken.

Hybrid Signatures: Each message is signed with both classical (Ed25519) and quantum-resistant (ML-DSA) algorithms. Successful verification requires the validity of both signatures, providing a layered defense.

PQ/T Hybrid Certificate Chains: Extending hybrid protection to the Root of Trust, using ML-DSA algorithms while balancing robust security with computational efficiency.

Hardware-Level Security: The Role of Secure Elements

For applications requiring the highest security assurance, dedicated hardware secure elements provide an additional layer of protection. The QUBIP project has demonstrated a complete hardware and software solution integrating a PQC hardware secure element with an STM32 microcontroller, establishing quantum-resistant communication channels.

This architecture offers several advantages:

Offloaded Cryptographic Operations: The secure element handles computationally intensive PQC operations, freeing the main processor for application tasks.

Physical Security: Hardware secure elements protect against physical attacks, side-channel analysis, and fault injection.

Flexible Configuration: Systems can be configured to perform cryptographic operations entirely in software or offload them to dedicated hardware, depending on security requirements.

India’s Role in the Post-Quantum Transition

India is positioning itself at the forefront of the post-quantum transition. In January 2026, SEALSQ signed a Memorandum of Understanding with the Government of Gujarat and Kaynes SemiCon to establish India’s first Secure Semiconductor Design, Test, and Personalization Center dedicated to post-quantum cryptography technologies.

The proposed facility, located at Kaynes SemiCon’s manufacturing campus in Sanand, Gujarat, is planned to achieve an annual production capacity of up to 300 million post-quantum secure semiconductors. This initiative aims to support India’s growing demand for quantum-resistant technologies across security-sensitive sectors, including government, defense, critical infrastructure, telecommunications, automotive, IoT, and digital identity.

For Indian electronics companies, this represents a significant opportunity. The ability to source quantum-resistant semiconductors from domestic manufacturing aligns with the government’s Atmanirbhar Bharat initiative and reduces reliance on offshore supply chains.

Practical Strategies for Future-Proof IoT Devices

For organizations beginning their post-quantum journey, the following strategies provide a practical roadmap:

1. Conduct a Cryptographic Inventory

Identify all devices in your portfolio that rely on public-key cryptography for secure boot, firmware updates, device authentication, or data encryption. Assess their expected operational lifetimes. Devices with long deployment horizons (5+ years) should be prioritized for PQC migration.

2. Adopt a Hybrid Cryptographic Architecture

For new product designs, implement hybrid cryptography combining classical and PQC algorithms. This provides immediate quantum resistance while maintaining compatibility with existing infrastructure and allowing flexibility as standards evolve.

3. Design for Crypto-Agility

Hardware and software architectures should support the ability to switch cryptographic algorithms without requiring hardware replacement. This may involve:

• Using modular firmware that can load new cryptographic libraries
• Selecting microcontrollers with sufficient memory headroom for future algorithm updates
• Incorporating hardware accelerators that support multiple algorithm families

Research on crypto-agile hardware implementations, such as the PHOENIX accelerator developed in recent academic work, demonstrates that unified hardware can efficiently support both lattice-based (ML-KEM) and code-based (HQC) schemes through innovative resource-sharing strategies.

4. Leverage Standards-Based Solutions

Deploy NIST-standardized algorithms (ML-KEM, ML-DSA, SLH-DSA) rather than proprietary or experimental alternatives. Standards provide interoperability, rigorous security analysis, and long-term support.

5. Secure the Boot Chain

The secure boot process is the foundation of device security. Ensure that the entire boot chain, from the Root of Trust to application firmware, is protected by hybrid signatures. The EU-funded FORTRESS project is developing scalable hybrid secure boot architectures that combine traditional and post-quantum algorithms.

The Cionlabs Advantage: Building Quantum-Ready Hardware

At Cionlabs, we design hardware for the post-quantum future. Our partnership with Beken, a pioneer in wireless chipsets, gives us access to the building blocks of secure, intelligent IoT devices. Our approach to future-proof security includes:

Hardware Root of Trust: Beken’s chipsets integrate dedicated TrustEngine components, providing secure boot, key management, and cryptographic acceleration that can support hybrid PQC implementations.

Memory and Performance Optimization: We design devices with sufficient memory headroom to accommodate PQC algorithms, ensuring that future firmware updates can enhance security without requiring hardware replacement.

India-Ready Design: Our products are engineered for India’s unique operating conditions, with robust power management and environmental resilience.

Security Expertise: Our team stays current with the evolving PQC standardization landscape, enabling us to recommend and implement the most appropriate algorithms for each use case.

Conclusion: The Time to Act is Now

The transition to post-quantum cryptography is one of the most significant security migrations in the history of computing. For organizations building long-lived IoT deployments, the window for action is finite. Devices designed today will still be in the field when quantum computers reach sufficient scale to break classical cryptography.

The good news is that practical solutions exist. Software libraries now enable PQC on devices with as little as 5KB of RAM. Hybrid cryptographic architectures provide immediate protection while maintaining flexibility. India is building domestic semiconductor capabilities to support the post-quantum transition.

At Cionlabs, we are ready to help you navigate this transition. Whether you are designing new products or considering how to secure existing deployments, our team can guide you through the technical choices and implementation strategies that will keep your devices secure for their entire operational lifetime.

The quantum future is coming. Ensure your products are ready.

Ready to build quantum-resistant IoT devices? Let’s start a conversation about future-proofing your product portfolio.

Cionlabs is an electronics design house specializing in IoT and AI-enabled hardware for the Indian market. Cionlabs partners with Beken, a pioneer in wireless chipsets, to deliver white-label products and custom designs for smart devices, industrial IoT, and critical infrastructure applications.