Post-Quantum
PostQuantum.com by Marin Ivezic – Quantum Security, PQC, Quantum Resistance, CRQC, Q-Day, Y2Q
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The Toffoli Gate: The Unsung Workhorse in Quantum Codebreaking
Understanding the Toffoli gate’s role isn’t just an academic exercise – it has real implications for when and how quantum computers might break our cryptography. Each Toffoli gate isn’t a single physical operation on today’s hardware; it has to be decomposed into the basic operations a quantum machine can do…
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Mitigating Quantum Threats Beyond PQC
The article explores limitations of PQC and explores alternative and complementary approaches to mitigate quantum risks. It provides technical analysis of each strategy, real-world examples of their deployment, and strategic recommendations for decision-makers. The goal is to illuminate why a diversified cryptographic defense – beyond just rolling out new algorithms…
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Introduction to Crypto-Agility
As we edge closer to the Q-Day—the anticipated moment when quantum computers will be capable of breaking traditional cryptographic systems—the need for crypto-agility becomes increasingly critical. Crypto-agility is the capability of an organization to swiftly and efficiently transition between different cryptographic algorithms and protocols in response to emerging threats and…
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Post-Quantum Cryptography (PQC) Introduction
Post-Quantum Cryptography (PQC) refers to cryptographic algorithms (primarily public-key algorithms) designed to be secure against an attack by a future quantum computer. The motivation for PQC is the threat that large-scale quantum computers pose to current cryptographic systems. Today’s widely used public-key schemes – RSA, Diffie-Hellman, and elliptic-curve cryptography –…
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Dos & Don’ts of Crypto Inventories for Quantum Readiness
Relying on asset owners, developers or IT personnel to identify and report in interviews or survey responses every instance of cryptographic usage is not just impractical; it simply does not work...
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Ready for Quantum: Practical Steps for Cybersecurity Teams
The journey towards quantum resistance is not merely about staying ahead of a theoretical threat but about evolving our cybersecurity practices in line with technological advancements. Starting preparations now ensures that organizations are not caught off guard when the landscape shifts. It’s about being informed, vigilant, and proactive—qualities essential to…
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Next-Generation QKD Protocols: A Cybersecurity Perspective
Traditional QKD implementations have demonstrated provably secure key exchange, but they come with practical limitations. To address these limitations, researchers have developed next-generation QKD protocols. These advanced protocols improve security by reducing trust assumptions and mitigating device vulnerabilities, and they enhance performance (key rate, distance) through novel techniques. The article…
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Evaluating Tokenization in the Context of Quantum Readiness
As the quantum era approaches, organizations face the daunting task of protecting their sensitive data from the looming threat of quantum computers. These powerful machines have the potential to render traditional cryptographic methods obsolete, making it imperative to explore innovative strategies for quantum readiness. One often overlooked yet highly promising…
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Quantum Computing – Looming Threat to Telecom Security
Since the early 2000s, the field of quantum computing has seen significant advancements, both in technological development and in commercialization efforts. The experimental demonstration of Shor's algorithm in 2001 proved to be one of the key catalyzing events, spurring increased interest and investment from both the public and private sectors.
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Adiabatic Quantum Computing (AQC) and Impact on Cyber
Adiabatic Quantum Computing (AQC), and its variant Quantum Annealing, are another model for quantum computation. It's a specialized subset of quantum computing focused on solving optimization problems by finding the minimum (or maximum) of a given function over a set of possible solutions. For problems that can be presented as…
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Entanglement-Based QKD Protocols: E91 and BBM92
While prepare-and-measure QKD currently leads the market due to simplicity and higher key rates, entanglement-based QKD protocols like E91 and BBM92 are at the heart of next-generation quantum communications. Ongoing improvements in photonic technology are steadily closing the gap in performance. The additional security guarantees (e.g., tolerance of untrusted devices)…
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Quantum Key Distribution (QKD) and the BB84 Protocol
Quantum Key Distribution (QKD) represents a radical advancement in secure communication, utilizing principles from quantum mechanics to distribute cryptographic keys with guaranteed security.Unlike classical encryption, whose security often relies on the computational difficulty of certain mathematical problems, QKD's security is based on the laws of physics, which are, as far…
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The Quantum Computing Threat
The secret sauce of quantum computing, which even Einstein called "spooky," is the ability to generate and manipulate quantum bits of data or qubits. Certain computational tasks can be executed exponentially faster on a quantum processor using qubits, than on a classical computer with 1s and 0s. A qubit can…
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Challenges of Upgrading to Post-Quantum Cryptography (PQC)
The shift to post-quantum cryptography is not a distant problem but an imminent challenge that requires immediate attention. The quantum threat affects all forms of computing—whether it’s enterprise IT, IoT devices, or personal electronics. Transitioning to quantum-resistant algorithms is a complex, resource-intensive task that demands coordination across the supply chain,…
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What’s the Deal with Quantum Computing: Simple Introduction
Quantum computing holds the potential to revolutionize fields where classical computers struggle, particularly in areas involving complex quantum systems, large-scale optimization, and cryptography. The power of quantum computing lies in its ability to leverage the principles of quantum mechanics—superposition and entanglement—to perform certain types of calculations much more efficiently than…
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