The development of quantum computing represents an evolutionary change to commonly used forms of public encryption, such as RSA that is designed to protect certain municipal systems which will create further vulnerabilities. Post-quantum cryptography (PQC) can provide a further level of encryption. This chapter discusses how post-quantum techniques can be used to secure the smart infrastructures that support an overall long-range planning process and possibly improve a city's resilience to respond to shocks. This chapter also demonstrates examples from practice, references implications for the original research, and makes recommendations for incorporating quantum resilient cryptography into the urban development agenda through systems thinking.
The development of quantum computing represents an evolutionary change to commonly used forms of public encryption, such as RSA that is designed to protect certain municipal systems which will create further vulnerabilities. Post-quantum cryptography (PQC) can provide a further level of encryption. This chapter discusses how post-quantum techniques can be used to secure the smart infrastructures that support an overall long-range planning process and possibly improve a city's resilience to respond to shocks. This chapter also demonstrates examples from practice, references implications for the original research, and makes recommendations for incorporating quantum resilient cryptography into the urban development agenda through systems thinking.
The use of IoT in the building of Smart cities has transformed how urban areas are managed, as people cannot only monitor in real-time but also automate and make decisions that rely on the data they gather. The post-quantum cryptography (PQC) adoption is a very urgent need as the current classical encryption techniques like RSA and ECC can be broken with quantum computers. The chapter discusses PQC usage in the real world, specifically, in terms of smart urban ecosystems and major areas. It includes real-life case studies of PQC pilotage or proposals in quantum-vulnerable settings to make them more resilient. Moreover, the chapter explains the cryptographic algorithms standardized by NIST, assesses their applicability to constrained IoT use, and proposes a Proof of Concept (PoC) architecture of a PQC-enabled smart city. The chapter is an interim between theory and practice and is a part of the overarching topic of quantum-safe and sustainable urban development, and it provides a practical plan to urban planners, technologists, and cybersecurity professionals.
As quantum computing advances, existing cryptographic techniques used in smart city infrastructures face increasing vulnerability, especially within internet of things (IoT) networks. This chapter explores the critical role of post-quantum cryptography (PQC) in securing urban IoT ecosystems against quantum threats while addressing sustainability challenges. It covers PQC principles, algorithm families, integration with IoT communication protocols, and the protection of critical sectors such as energy, healthcare, and transportation. The chapter also explores quantum-specific network attacks, supply chain vulnerabilities, and the role of green cryptography and AI-assisted security. Emphasis is placed on balancing quantum resilience with energy efficiency to ensure secure, scalable, and sustainable smart cities. The chapter concludes by identifying future research directions to guide the transition toward quantum-safe and eco-conscious urban infrastructure.
The emergence of quantum computing poses significant threats to classical cryptographic systems, particularly in smart urban environments powered by the internet of things (IoT). This chapter explores the sustainability aspects and future prospects of integrating post-quantum cryptography (PQC) into IoT-based infrastructures. It examines various PQC algorithms, their deployment challenges in resource-constrained devices, and the trade-offs between energy efficiency, performance, and security. The chapter also highlights quantum-specific threats, including communication vulnerabilities and supply chain risks, and emphasizes sustainable strategies such as lightweight cryptography, hybrid models, green computing paradigms, and AI-based optimization. Future research directions call for energy-efficient algorithm design, cryptographic hardware co-development, and multidisciplinary collaboration. The study underscores the importance of aligning cryptographic resilience with long-term sustainability goals in smart city systems.
As cities adopt integrated IoT ecosystems and data-driven urban governance, traditional encryption faces the threat of obsolescence by quantum computing attacks. This chapter explores the application of quantum cryptography in protecting smart urban infrastructure, with a focus on quantum key distribution (QKD), post-quantum algorithms, and hybrid systems. Through an examination of deployments in smart grids, traffic management systems, and public health platforms, we illustrate how quantum-resistant protocols reduce threats of data breaches and spoofing attacks. There are special challenges: scaling QKD to millions of IoT devices will need new network architectures, and integrating with legacy systems will need phased “crypto-agility” plans. The chapter presents a model for incorporating quantum-safe practice into urban design, with an emphasis on inter-disciplinary collaboration among cryptographers, policymakers, and city administrators.
The growth of Internet of Things (IoT) devices has driven the evolution of smart cities that enable enhanced efficiency, sustainability, and citizen well-being. This chapter provides an in-depth strategy for the development and integration of lightweight post-quantum cryptography (PQC)-based protocols, especially for IoT devices within secure city infrastructures. The suggested architecture combines lattice-based key exchange (CRYSTALS-Kyber), lattice-based digital signatures (CRYSTALS-Dilithium), Grover-resistant symmetric encryption, and AI-powered intrusion detection. Key compression, signature aggregation, and adaptive security configurations are the added protocol improvements. This approach involves risk analysis, modeling, and performance evaluation (latency, energy, bandwidth, packet loss) and is significantly advanced over legacy RSA/ECC models, offering quantum-resilient security with efficiency for large-scale IoT networks.
Smart Cities rely on high-density digital infrastructures that include Internet of Things (IoT) devices, Artificial Intelligence (AI), cloud computing, digital identity systems, and operational technology. Although these systems improve efficiency and sustainability, they also provide a large cyber-physical attack surface. The problem is exacerbated by the advent of quantum computing, as popular public-key ciphers like RSA and elliptic-curve cryptography can be broken using quantum algorithms such as Shor's algorithm (Shor, 1994; Mosca, 2018). Smart cities rely on long-term data confidentiality, certificate-based trust, and remote management of critical infrastructure. This presents a strategic cyber resilience challenge. This thesis examines the impact of quantum technology on smart cities' cyber resilience, as well as how quantum-safe mechanisms can be integrated into urban digital infrastructure. The updated proposal now includes a critical literature review, case reasoning by comparison, a threat and vulnerability matrix, and a simulated BB84 quantum key distribution demonstration. According to NIST (2024b, 2024c, 2024d) and Pirandola et al. (2020), this thesis supports post-quantum cryptography (PQC) NIST standards FIPS 203, FIPS 204, and FIPS 205 as a scalable software migration strategy and quantum key distribution (QKD) as a selective protection strategy for high-value fixed communication links. The analysis demonstrates that quantum-safe resilience cannot be achieved solely through one technology. Any practical smart city transition must include a cryptographic inventory, data lifetime assessment, risk-based prioritization of critical services, hybrid migration, continuous monitoring, and governance. According to the simulation, the quantum bit error rate increases during the intercept-resend attack, alerting Alice and Bob to the eavesdropping activity and allowing them to discard the common key. The proposed framework integrates post-quantum cryptography for a wide range of software and cloud services, quantum key distribution for specific critical infrastructure links, and NIST Cybersecurity Framework 2.0 governance functions to ensure ongoing operational resilience.