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Quantum-Safe (Post-Quantum) Cryptography for Secure Network Infrastructures

Augustine Chidiebere Onuora, Taiwo Adisa Oyeniran, Trajkumar Yesuraj

Published Jul 29, 2026• 0 citations
Publisher

Abstract

Cryptography from ages have been designed and used to hide important information from people who they are not meant for. It refers to the art of concealment of information that only the person with right public key decodes or unzips the information for understanding. Due to the growing rise in quantum computers, Post quantum cryptography is now an important topic. This is not about updating or upgrading our normal cryptographic primitives but an architectural shift towards building systems that can without the sheer bruteforce of quantum computation. For one to fully understand why this shift is necessary, we need to look at it from a perceptive that reveals the current limitations of the current classical computers. The devices we use currently in our every day computation like laptops, phones, even the old desktop systems in our university labs, all operate using bits. The bit is either a zero ‘0’ or a one ‘1’ that represents a particular state of the computer like a rigid on or off switch, that means everything a classical computer does, from opening a file to running statistical analysis on data, is built from these two possible states. However, the case is different for a quantum computer. For quantum computers, they introduce a paradigm shift by utilizing the ‘Qubit’ which is a four-state superposition rather than the two-state position of the classical computer. Unlike classical bits that exist strictly as 0 or 1, a qubit can occupy a superposition of multiple states at the same time. Physically, qubits are implemented using real particles such as ions trapped in electromagnetic fields, neutral atoms, individual photons, or electrons confined inside semiconductor structures. These physical carriers are then integrated into quantum processors where they store, manipulate, and transmit quantum information. Simply put, while the classical bit is a single note, the Qubit is a symphony playing simultaneously. This four-state ability is what makes quantum computers potentially more powerful and also what makes our current classical cryptography vulnerable unless we replace them with post-quantum methods. This is why quantum-safe cryptography is essential for the safety of our computing and network infrastructure.

DOI
10.70593/978-93-7185-255-5_12

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Cryptography from ages have been designed and used to hide important information from people who they are not meant for. It refers to the art of concealment of information that only the person with right public key decodes or unzips the information for understanding. Due to the growing rise in quantum computers, Post quantum cryptography is now an important topic. This is not about updating or upgrading our normal cryptographic primitives but an architectural shift towards building systems that can without the sheer bruteforce of quantum computation. For one to fully understand why this shift is necessary, we need to look at it from a perceptive that reveals the current limitations of the current classical computers. The devices we use currently in our every day computation like laptops, phones, even the old desktop systems in our university labs, all operate using bits. The bit is either a zero ‘0’ or a one ‘1’ that represents a particular state of the computer like a rigid on or off switch, that means everything a classical computer does, from opening a file to running statistical analysis on data, is built from these two possible states. However, the case is different for a quantum computer. For quantum computers, they introduce a paradigm shift by utilizing the ‘Qubit’ which is a four-state superposition rather than the two-state position of the classical computer. Unlike classical bits that exist strictly as 0 or 1, a qubit can occupy a superposition of multiple states at the same time. Physically, qubits are implemented using real particles such as ions trapped in electromagnetic fields, neutral atoms, individual photons, or electrons confined inside semiconductor structures. These physical carriers are then integrated into quantum processors where they store, manipulate, and transmit quantum information. Simply put, while the classical bit is a single note, the Qubit is a symphony playing simultaneously. This four-state ability is what makes quantum computers potentially more powerful and also what makes our current classical cryptography vulnerable unless we replace them with post-quantum methods. This is why quantum-safe cryptography is essential for the safety of our computing and network infrastructure.
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In today’s digital world, most of our personal, financial, and health data is stored online. This makes cybersecurity extremely important — but also more challenging. Recent cyberattacks like the one on Australia’s MediSecure show how weak security can lead to huge losses. Now, a new risk is emerging: quantum computers. These work very differently from classical computers and can break the encryption methods (like RSA and AES) that we currently use to protect online data. This paper explains how cryptography works, what types exist (symmetric and asymmetric), and why current systems may not survive in a world where quantum computers are common. It introduces powerful quantum algorithms like Shor’s and Grover’s, which can break RSA and weaken AES much faster using quantum computers than any normal computers. This shows the power of quantum computers. These developments have pushed scientists to create new encryption systems called Post-Quantum Cryptography (PQC), which are built to resist quantum attacks but still run on regular devices. The paper also explores how quantum computing is evolving — from early research in the 1980s to real working processors today — and how countries and companies are investing in this technology. It suggests that in the future, people may access quantum computers over the cloud, rather than owning them. Finally, this research shows that the rise of quantum computing is both a threat and an opportunity. It challenges us to update our security systems, but it also opens the door for new startups and careers in quantum-safe cybersecurity.
The paper proposes strategic steps that organizations can take to future-proof their security architecture against quantum threats for the security of data integrity and confidentiality in the post-quantum era. it is a very threat that quantum computing is advancing too fast, and the classical cryptographic systems will be in danger. Therefore, we need to modify the methods of cryptography in Quantum- Safe Cryptography. In this paper, we focus on exposing the vulnerabilities of existing public-key cryptosystems faced with quantum attacks and the direction of the post-quantum cryptographic (PQC) algorithm in securing the underlain infrastructure. The paper discusses ongoing efforts to standardize cryptosystems led by the National Institute of Standards and Technology (NIST). It overviews several quantum-resistant cryptographic techniques: lattice-based, hash-based, and code-based examples. Moreover, the paper also outlines difficulties in implementing quantum-safe cryptography solutions into currently in-place cybersecurity frameworks, especially in the finance, healthcare, and critical infrastructure industries.
The paper proposes strategic steps that organizations can take to future-proof their security architecture against quantum threats for the security of data integrity and confidentiality in the post-quantum era. it is a very threat that quantum computing is advancing too fast, and the classical cryptographic systems will be in danger. Therefore, we need to modify the methods of cryptography in Quantum-Safe Cryptography. In this paper, we focus on exposing the vulnerabilities of existing public-key cryptosystems faced with quantum attacks and the direction of the post-quantum cryptographic (PQC) algorithm in securing the underlain infrastructure. The paper discusses ongoing efforts to standardize cryptosystems led by the National Institute of Standards and Technology (NIST). It overviews several quantum-resistant cryptographic techniques: lattice-based, hash-based, and code-based examples. Moreover, the paper also outlines difficulties in implementing quantum-safe cryptography solutions into currently in-place cybersecurity frameworks, especially in the finance, healthcare, and critical infrastructure industries.
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In the last few years the threat of quantum computers has become bigger and bigger. The fast computing of the quantum computers puts everything in danger that relies on classical cryptographic algorithms. The question of when a large-scale quantum computer will be built cannot be exactly answered yet. According to the Cloud Security Alliance at around 2030 the power of quantum computers will increase so that the risk for exposure of traditionally encrypted data will be very high. PKI (Public Key Infrastructure) relies on asymmetric cryptographic algorithms and is widely used in many fields. So it is important that it will be completely safe. The way to provide that is to change traditional cryptographic algorithms to post-quantum cryptography algorithms or hybrid solutions. To this, we review in this paper the basics of classical PKI and quantum cryptography methods and the threat of quantum computing for PKI. We present quantum-safe solutions already in use and recommend new, well-performing solutions for a quantum-resistant PKI by comparison.