Post-Quantum
PostQuantum.com by Marin Ivezic – Quantum Security, PQC, Quantum Resistance, CRQC, Q-Day, Y2Q
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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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Introduction to Quantum Random Number Generation (QRNG)
Cryptographic systems rely on the unpredictability and randomness of numbers to secure data. In cryptography, the strength of encryption keys depends on their unpredictability. Unpredictable and truly random numbers—those that remain secure even against extensive computational resources and are completely unknown to adversaries—are among the most essential elements in cryptography…
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Shor’s Algorithm: A Quantum Threat to Modern Cryptography
Shor’s Algorithm is more than just a theoretical curiosity – it’s a wake-up call for the security community. By understanding its principles and implications, we can appreciate why the cryptographic landscape must evolve. The goal of this guide is to equip you with that understanding, without delving into complex mathematics,…
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Grover’s Algorithm and Its Impact on Cybersecurity
Grover’s algorithm was one of the first demonstrations of quantum advantage on a general problem. It highlighted how quantum phenomena like superposition and interference can be harnessed to outperform classical brute force search. Grover’s is often described as looking for “a needle in a haystack” using quantum mechanics.
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Quantum-Safe vs. Quantum-Secure Cryptography
In 2010, I was serving as an interim CISO for an investment bank. During that time, I was already trying to figure out the risks posed by quantum computing. One day, I was approached by a vendor who, with great confidence, made two bold claims. First, they insisted that the…
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