# PostQuantum - Quantum Computing, Quantum Security, PQC --- ## Pages - [PQC ROI Calculator](https://q-day.org/pqc-roi-calculator/) - [CRQC Readiness Benchmark (Q-Day Estimator)](https://q-day.org/crqc-readiness-benchmark-q-day-estimator/): Use the CRQC Readiness Benchmark (Q‑Day Estimator) to turn assumptions into a defensible, crypto‑specific forecast. The tool converts four inputs,... - [License](https://q-day.org/license/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - [Articles - PostQuantum - Marin Ivezic](https://q-day.org/articles-post-quantum/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - [Privacy Policy](https://q-day.org/privacy-policy/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - [Cookie Policy](https://q-day.org/cookie-policy/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - [Terms and Conditions](https://q-day.org/terms-and-conditions/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - [Q-Day.org - Q-Day, Y2Q, PQC, Quantum Readiness, Quantum Security](https://q-day.org/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - [Marin Ivezic](https://q-day.org/marin-ivezic/): Marin Ivezic is a quantum and cybersecurity entrepreneur and the CEO of Applied Quantum - first quantum-dedicated end-to-end consultancy - [Marin's Q-Day Prediction - Timeline](https://q-day.org/marin-q-day-prediction/): q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q --- ## Posts - [CRQC Readiness Benchmark vs. Quantum Threat Tracker (QTT)](https://q-day.org/q-day/crqc-readiness-benchmark-vs-qtt/): I will try and compare my proposed CRQC Readiness Benchmark with QTT, highlighting fundamental differences in methodology, assumptions... - [How You, Too, Can Predict Q-Day (Without the Hype)](https://q-day.org/q-day/how-to-predict-q-day/): For three decades, Q-Day has been “just a few years away.” I want to show you how to make your own prediction on when Q-Day will arrive. - [The Trouble with Quantum Computing and Q-Day Predictions](https://q-day.org/q-day/q-day-predictions/): The trouble with quantum computing predictions so far has been that too many have been more speculation than science... - [Quantum Threat Tracker (QTT) Review Praising the Tool Questioning the Demo](https://q-day.org/q-day/qtt-criticism/): The Quantum Threat Tracker (QTT) is a newly released open-source tool by Cambridge Consultants and the University of Edinburgh... - [What is the Quantum Threat? A Guide for C‑Suite Executives and Boards](https://q-day.org/q-day/quantum-threat-executives-board/): Boards do not need to dive into the scientific intricacies of qubits and algorithms, but they do need to recognize that this is an important risk... - [CRQC Readiness Benchmark - Benchmarking Quantum Computers on the Path to Breaking RSA-2048](https://q-day.org/q-day/crqc-readiness-benchmark/): Benchmarking quantum capabilities for cryptography is both critical and challenging. We can’t rely on any single metric like qubit count... - [Q-Day Revisited - RSA-2048 Broken by 2030: Detailed Analysis](https://q-day.org/q-day/q-day-y2q-rsa-broken-2030/): It’s time to mark a controversial date on the calendar: 2030 is the year RSA-2048 will be broken by a quantum computer - or the Q-Day. - [What Is Q-Day (Y2Q)?](https://q-day.org/q-day/q-day-y2q/): Q-Day, sometimes called “Y2Q” or the “Quantum Apocalypse”, refers to the future moment when a quantum computer becomes powerful enough - [The Enormous Energy Cost of Breaking RSA‑2048 with Quantum Computers](https://q-day.org/q-day/energy-cost-rsa-2048-quantum/): The energy requirements for breaking RSA-2048 with a quantum computer underscore how different the post-quantum threat is... - [Breaking RSA Encryption: Quantum Hype Meets Reality (2022–2025)](https://q-day.org/q-day/breaking-rsa-quantum-hype/): If you encrypted a message with an RSA-2048 public key today, no one on Earth knows how to factor it with currently available technology... - [4,099 Qubits: The Myth and Reality of Breaking RSA-2048 with Quantum Computers](https://q-day.org/q-day/4099-qubits-rsa/): 4,099 is the widely cited number of quantum bits one would need to factor a 2048-bit RSA key using Shor’s algorithm – in other words... - [What Will Really Happen Once Q-Day Arrives – When Our Current Cryptography Is Broken?](https://q-day.org/q-day/q-day-y2q-what-will-happen/): How Q-Day is likely to unfold and why its arrival, while not a sudden Armageddon, will fundamentally change how we secure our world. - [Q-Day Predictions: Anticipating the Arrival of CRQC](https://q-day.org/q-day/q-day-crqc-predictions/): While the exact arrival date of Q-Day remains uncertain, the necessity for immediate and strategic preparation does not. - [Harvest Now, Decrypt Later (HNDL) Risk](https://q-day.org/q-day/harvest-now-decrypt-later-hndl/): "Harvest Now, Decrypt Later" (HNDL) is a cybersecurity threat where adversaries collect encrypted data today to decrypt it in the future - [Cryptographically Relevant Quantum Computers (CRQCs)](https://q-day.org/q-day/crqc/): Cryptographically Relevant Quantum Computers (CRQCs) represent a seismic shift on the horizon of cybersecurity... - [Neven’s Law: The Doubly Exponential Surge of Quantum Computing](https://q-day.org/q-day/nevens-law/): In 2019, Google’s Quantum AI director Hartmut Neven noticed something remarkable: within a matter of months, the computing muscle... - [CRQC Readiness Index Proposal](https://q-day.org/q-day/crqc-readiness-index/): This proposal outlines a composite, vendor‑neutral “CRQC Readiness” indicator. It intentionally avoids one‑number vanity metrics... - [Q-Day (Y2Q) vs. Y2K](https://q-day.org/q-day/q-day-y2q-y2k/): In the late 1990s, organizations worldwide poured time and money into exorcising the “millennium bug.” Y2K remediation was a global scramble. - [What’s the Deal with Quantum Computing: Simple Introduction](https://q-day.org/q-day/quantum-computing-introduction/): I'll try and break down the concepts of quantum computing, explore why it's better than classical computing for certain tasks, and discuss... - [Shor’s Algorithm: A Quantum Threat to Modern Cryptography](https://q-day.org/q-day/shors-algorithm-a-quantum-threat/): Shor’s Algorithm is more than just a theoretical curiosity – it’s a wake-up call for the security community... - [Grover’s Algorithm and Its Impact on Cybersecurity](https://q-day.org/q-day/grovers-algorithm/): Grover’s algorithm is a fundamental quantum computing algorithm that dramatically accelerates unstructured search tasks... --- # # Detailed Content ## Pages - Published: 2025-08-15 - Modified: 2025-08-19 - URL: https://q-day.org/pqc-roi-calculator/ --- - Published: 2025-08-13 - Modified: 2025-08-13 - URL: https://q-day.org/crqc-readiness-benchmark-q-day-estimator/ --- > q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - Published: 2025-04-28 - Modified: 2025-04-28 - URL: https://q-day.org/license/ --- > q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - Published: 2023-09-17 - Modified: 2025-04-19 - URL: https://q-day.org/privacy-policy/ --- > q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - Published: 2023-09-17 - Modified: 2025-04-19 - URL: https://q-day.org/cookie-policy/ --- > q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - Published: 2023-09-17 - Modified: 2025-04-19 - URL: https://q-day.org/terms-and-conditions/ --- > Marin Ivezic is a quantum and cybersecurity entrepreneur and the CEO of Applied Quantum - first quantum-dedicated end-to-end consultancy - Published: 2023-05-21 - Modified: 2025-08-13 - URL: https://q-day.org/marin-ivezic/ --- > q-day.org - Marin Ivezic - Articles on Quantum Computing, Quantum Tech, Quantum Resistance, Post-Quantum, PQC, CRQC, Q-Day, Y2Q - Published: 2020-04-11 - Modified: 2025-08-12 - URL: https://q-day.org/marin-q-day-prediction/ --- --- ## Posts > I will try and compare my proposed CRQC Readiness Benchmark with QTT, highlighting fundamental differences in methodology, assumptions... - Published: 2025-08-10 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/crqc-readiness-benchmark-vs-qtt/ - Categories: Q-Day I will try and compare my proposed CRQC Readiness Benchmark with QTT, highlighting fundamental differences in methodology, assumptions, and philosophy, all in an effort to clarify how each approach informs our understanding of the looming “Q-Day.” The goal is to articulate why my benchmark and QTT produce different outlooks (2030s vs. 2050s for RSA-2048), and how both can be used together to guide post-quantum readiness. --- > For three decades, Q-Day has been “just a few years away.” I want to show you how to make your own prediction on when Q-Day will arrive. - Published: 2025-08-10 - Modified: 2025-08-14 - URL: https://q-day.org/q-day/how-to-predict-q-day/ - Categories: Q-Day - Tags: howto For three decades, Q-Day has been “just a few years away.” I want to show you how to make your own informed prediction on when Q-Day will arrive. Counting physical qubits by itself is misleading. To break RSA you need error‑corrected logical qubits, long and reliable operation depth, and enough throughput to finish within an attack‑relevant time window. --- > The trouble with quantum computing predictions so far has been that too many have been more speculation than science... - Published: 2025-08-04 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/q-day-predictions/ - Categories: Q-Day The trouble with quantum computing predictions so far has been that too many have been more speculation than science, more influenced by bias than by balanced analysis. We have the tools and knowledge to do better. By embracing a data-driven, scenario-based approach, we can turn timeline forecasting from a source of confusion into a valuable planning aid. --- > The Quantum Threat Tracker (QTT) is a newly released open-source tool by Cambridge Consultants and the University of Edinburgh... - Published: 2025-08-03 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/qtt-criticism/ - Categories: Q-Day The Quantum Threat Tracker (QTT) is a newly released open-source tool by Cambridge Consultants and the University of Edinburgh that aims to forecast when quantum computers will break today’s encryption. It combines quantum resource estimation (using optimized variants of Shor’s algorithm) with hardware development roadmaps to predict when cryptographic protocols will be broken. In other words, QTT estimates how many qubits and runtime are needed to crack something like RSA, then projects forward based on how quickly quantum hardware might improve. This is a much-needed tool – it translates complex research into an interactive format for security planners. I have no criticism of the tool or its authors; in fact, I think QTT is a great resource that could become very useful for the community. However, I do disagree with its default assumptions and demo scenario, which paint an arguably overly conservative timeline for the “Q-Day” when encryption like RSA-2048 falls. --- > Boards do not need to dive into the scientific intricacies of qubits and algorithms, but they do need to recognize that this is an important risk... - Published: 2025-07-19 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/quantum-threat-executives-board/ - Categories: Q-Day Boards do not need to dive into the scientific intricacies of qubits and algorithms, but they do need to recognize that this is a strategically important risk – one that can’t be simply delegated away. It requires the same level of governance attention as other enterprise-level risks like financial compliance, geopolitical factors, or pandemic preparedness. The comforting news is that if organizations act early, the quantum threat can be managed. Think of the proactive stance many companies took with Y2K in the late 1990s – those who started early averted disaster. Similarly here, those who begin preparing for quantum now (even while the technology is still maturing) will be in the best position to avoid chaos later. Early movers might even gain competitive advantages, by earning customer trust through their security resilience or by integrating quantum-safe technologies into their innovation roadmaps. In the end, addressing the quantum cybersecurity threat is about preserving trust. --- > Benchmarking quantum capabilities for cryptography is both critical and challenging. We can’t rely on any single metric like qubit count... - Published: 2025-07-03 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/crqc-readiness-benchmark/ - Categories: Q-Day - Tags: howto Benchmarking quantum capabilities for cryptography is both critical and challenging. We can’t rely on any single metric like qubit count to tell us how near we are to breaking RSA-2048. A combination of logical qubit count, error-corrected circuit depth, and operational speed must reach certain thresholds in unison. Existing benchmarks – Quantum Volume, Algorithmic Qubits, etc. – each address parts of this, but a CRQC-specific yardstick brings them together. By focusing on a concrete goal (factoring a 2048-bit RSA key), I defined a composite measure of progress. This new benchmark suggests that, as of 2025, we are perhaps on the order of one-tenth of the way there (in capability), but the pace of improvement is accelerating. With major leaps in algorithm efficiency and hardware roadmaps aiming at fault-tolerant machines by 2029, we could plausibly hit the needed 1000 logical qubits and 10^12 operations within ~5–7 years. That puts Q-Day around 2030 – aligning with the latest expert predictions that RSA-2048 will fall in the “very early 2030s” timeframe. --- > It’s time to mark a controversial date on the calendar: 2030 is the year RSA-2048 will be broken by a quantum computer - or the Q-Day. - Published: 2025-06-19 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/q-day-y2q-rsa-broken-2030/ - Categories: Q-Day - Tags: prediction It’s time to mark a controversial date on the calendar: 2030 is the year RSA-2048 will be broken by a quantum computer. That’s my bold prediction, and I don’t make it lightly. In cybersecurity circles, the countdown to “Q-Day” or Y2Q (the day a cryptographically relevant quantum computer cracks our public-key encryption) has been a topic of intense debate. Lately, the noise has become deafening: some doom-and-gloom reports insist the quantum cryptopocalypse is just a year or two away, while hardened skeptics claim it’s so distant as to never happen. The truth lies between these extremes. A sober analysis of the latest breakthroughs shows that Q-Day is not here yet and won’t happen tomorrow – but it’s also no longer on the hazy horizon of “maybe never.” In fact, recent advances have dramatically sharpened the timeline, bringing the fall of RSA into the plausible timeframe of around 2030. --- > Q-Day, sometimes called “Y2Q” or the “Quantum Apocalypse”, refers to the future moment when a quantum computer becomes powerful enough - Published: 2025-06-02 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/q-day-y2q/ - Categories: Q-Day Q-Day, sometimes called “Y2Q” or the “Quantum Apocalypse”, refers to the future moment when a quantum computer becomes powerful enough to break modern encryption algorithms. In other words, it’s the day a cryptographically relevant quantum computer (CRQC) can crack the public-key cryptography (like RSA or ECC) that underpins our digital security. The term “Y2Q” stands for “years to quantum,” an explicit nod to the Y2K bug - but unlike Y2K’s fixed deadline, the timing of Q-Day is unknown. It won’t announce itself with a clear date or time. There will be no midnight turn of the century when the problem visibly triggers. Instead, Q-Day could arrive without fanfare: one day all our encrypted data and communications appear normal, but behind the scenes one of the fundamental pillars of digital trust has crumbled. --- > The energy requirements for breaking RSA-2048 with a quantum computer underscore how different the post-quantum threat is... - Published: 2025-04-24 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/energy-cost-rsa-2048-quantum/ - Categories: Q-Day The energy requirements for breaking RSA-2048 with a quantum computer underscore how different the post-quantum threat is from conventional hacking. It’s not just about qubits and math; it’s about megawatts, cooling systems, and power grids. Today, that reality means only the most potent actors would even contemplate such attacks, and even then only for the crown jewels of intelligence. Tomorrow, advances in both quantum engineering and energy production could erode even that barrier. The enormous costs – in dollars and joules – of quantum cryptanalysis serve as a stark warning and a call to action. They buy us time to fortify our cryptographic defenses, but not an indefinite amount of time. In the end, whether or not our data remains secure in the quantum age may depend as much on developments in high-energy physics as on breakthroughs in quantum algorithms. The prudent course for defenders is clear: assume the worst-case scenario (a powerful CRQC powered by abundant energy) will eventually come to pass, and move urgently toward encryption that can withstand that future. --- > If you encrypted a message with an RSA-2048 public key today, no one on Earth knows how to factor it with currently available technology... - Published: 2025-04-02 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/breaking-rsa-quantum-hype/ - Categories: Q-Day To put it plainly, if you encrypted a message with an RSA-2048 public key today, no one on Earth knows how to factor it with currently available technology, even if they threw every quantum computer and supercomputer we have at the task. That may change in the future – perhaps in a decade or even less if quantum tech continues its exponential development. Or perhaps some new algorithmic insight will emerge (the door is never completely closed in research). But the events of 2022–2025 ultimately reinforced the cautious view: quantum computing is making steady progress, but it hasn’t rendered classical encryption obsolete just yet. We should be excited by the advances – factoring 48-bit numbers with 10 qubits is a fantastic scientific achievement – without jumping to premature conclusions about the end of RSA. --- > 4,099 is the widely cited number of quantum bits one would need to factor a 2048-bit RSA key using Shor’s algorithm – in other words... - Published: 2024-03-05 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/4099-qubits-rsa/ - Categories: Q-Day 4,099 is the widely cited number of quantum bits one would need to factor a 2048-bit RSA key using Shor’s algorithm – in other words, the notional threshold at which a quantum computer could crack one of today’s most common encryption standards. The claim has an alluring simplicity: if we could just build a quantum machine with a few thousand perfect qubits, decades of RSA-protected secrets would fall in seconds. But where does this “4,099 logical qubits” figure actually come from, and what does it really mean? The story behind it reveals both how far quantum algorithms have come and how much further quantum hardware needs to go. --- > How Q-Day is likely to unfold and why its arrival, while not a sudden Armageddon, will fundamentally change how we secure our world. - Published: 2023-09-15 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/q-day-y2q-what-will-happen/ - Categories: Q-Day As the world edges closer to the era of powerful quantum computers, experts warn of an approaching “Q-Day” (sometimes called Y2Q or the Quantum Apocalypse): the day a cryptographically relevant quantum computer can break our current encryption. Unlike the Y2K bug—which had a fixed deadline and was mostly defused before the clock struck midnight—Q-Day won’t announce itself with a clear date or time. We won’t see computers suddenly crash or planes fall from the sky at a stroke of midnight. Instead, when quantum code-breaking arrives, the world might not notice anything visibly “wrong” at first. Websites will still load, apps will open, and bank transactions will go through. But underneath that normalcy, one of the fundamental pillars of digital trust will have crumbled. Imagine waking up the morning after Q-Day: all the data and communications long protected by encryption—financial records, personal emails, business secrets, even national security intel—are no longer guaranteed safe. It sounds dramatic, but it won’t be chaos in an instant. Rather, it marks the start of a new, more dangerous phase of the digital age. Let's explore how Q-Day is likely to unfold and why its arrival, while not a sudden Armageddon, will fundamentally change how we secure our world. --- > While the exact arrival date of Q-Day remains uncertain, the necessity for immediate and strategic preparation does not. - Published: 2023-07-27 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/q-day-crqc-predictions/ - Categories: Q-Day While CRQCs capable of breaking current public key encryption algorithms have not yet materialized, technological advancements are pushing us towards what is ominously dubbed 'Q-Day'—the day a CRQC becomes operational. Many experts believe that Q-Day, or Y2Q as it's sometimes called, is just around the corner, suggesting it could occur by 2030 or even sooner; some speculate it may already exist within secret government laboratories. --- > "Harvest Now, Decrypt Later" (HNDL) is a cybersecurity threat where adversaries collect encrypted data today to decrypt it in the future - Published: 2023-06-08 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/harvest-now-decrypt-later-hndl/ - Categories: Q-Day "Harvest Now, Decrypt Later" (HNDL), also known as "Store Now, Decrypt Later" (SNDL), is a concerning risk where adversaries collect encrypted data with the intent to decrypt it once quantum computing becomes capable of breaking current encryption methods. This is the quantum computing's ticking time bomb, with potential implications for every encrypted byte of data currently considered secure. --- > Cryptographically Relevant Quantum Computers (CRQCs) represent a seismic shift on the horizon of cybersecurity... - Published: 2023-01-10 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/crqc/ - Categories: Q-Day Cryptographically Relevant Quantum Computers (CRQCs) represent a seismic shift on the horizon of cybersecurity. In this article, we’ve seen that CRQCs are defined by their ability to execute quantum algorithms (like Shor’s and Grover’s) at a scale that breaks the cryptographic primitives we rely on daily. While still likely years (if not a decade or more) away, their eventual arrival is not a question of “if” but “when,” according to most experts . --- > In 2019, Google’s Quantum AI director Hartmut Neven noticed something remarkable: within a matter of months, the computing muscle... - Published: 2022-12-30 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/nevens-law/ - Categories: Q-Day In 2019, Google’s Quantum AI director Hartmut Neven noticed something remarkable: within a matter of months, the computing muscle of Google’s best quantum processors leapt so quickly that classical machines struggled to keep up. This observation gave birth to “Neven’s Law,” a proposed rule of thumb that quantum computing power is advancing at a doubly exponential rate – far outpacing the steady exponential progress of Moore’s Law. In Neven’s words, with double-exponential growth “it looks like nothing is happening, nothing is happening, and then whoops, suddenly you’re in a different world”. Neven’s Law offers a provocative lens on how fast quantum breakthroughs might arrive and what that means for technology and security. --- > This proposal outlines a composite, vendor‑neutral “CRQC Readiness” indicator. It intentionally avoids one‑number vanity metrics... - Published: 2020-12-25 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/crqc-readiness-index/ - Categories: Q-Day This proposal outlines a composite, vendor‑neutral “CRQC Readiness” indicator. It intentionally avoids one‑number vanity metrics (like only counting qubits) and instead triangulates from three ingredients that actually matter for breaking today’s crypto: usable (logical) qubits, error‑tolerant algorithm depth, and sustained error‑corrected operations per second. --- > In the late 1990s, organizations worldwide poured time and money into exorcising the “millennium bug.” Y2K remediation was a global scramble. - Published: 2019-04-04 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/q-day-y2q-y2k/ - Categories: Q-Day In the late 1990s, organizations worldwide poured time and money into exorcising the “millennium bug.” Y2K remediation was a global scramble. That massive effort succeeded: when January 1, 2000 hit, planes didn’t fall from the sky and power grids stayed lit. Ever since, Y2K has been held up as both a model of proactive risk management and, paradoxically, a punchline about overhyped tech doomsaying. Today, as boards hear warnings about cryptography-shattering quantum computers, the comparison to Y2K is increasingly cropping up. It’s easy to see why: preparing for “Q-Day”, the moment a quantum computer can crack RSA/ECC encryption, also involves updating or replacing countless systems in time to avoid a digital disaster. However, analogies can be double-edged. While the Y2K saga offers valuable lessons in mobilization and urgency, it also tempts us with false comfort. Many recall Y2K as the crisis that never materialized, which can breed a dangerous “nothing will happen” mindset about Q-Day. --- > I'll try and break down the concepts of quantum computing, explore why it's better than classical computing for certain tasks, and discuss... - Published: 2019-04-04 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/quantum-computing-introduction/ - Categories: Q-Day 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 classical computers. --- > Shor’s Algorithm is more than just a theoretical curiosity – it’s a wake-up call for the security community... - Published: 2017-10-18 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/shors-algorithm-a-quantum-threat/ - Categories: Q-Day 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, so you can make informed decisions about protecting your organization’s data against the quantum threat. --- > Grover’s algorithm is a fundamental quantum computing algorithm that dramatically accelerates unstructured search tasks... - Published: 2017-08-14 - Modified: 2025-08-12 - URL: https://q-day.org/q-day/grovers-algorithm/ - Categories: Q-Day 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. --- ---