Quantum Computing and Cybersecurity: Unveiling the Double-edged Sword

5 min readMar 19


Quantum computing has garnered significant attention in recent years due to its potential to revolutionize the world of information technology. While its capabilities can bring numerous benefits, it also poses considerable risks to cybersecurity. In this article, we will first explain how regular and quantum computers process information, then discuss the benefits of quantum computing, and finally delve into the implications for cybersecurity, with a focus on password cracking.

How The Computers We Use Process

Our computers, your phone, also known as classical computers, process information using bits. Bits are the smallest units of data and can have a value of either 0 or 1. These bits are used to represent and process information in binary code, which is a series of 0s and 1s. Classical computers perform calculations and solve problems by manipulating these bits through various operations, such as addition, subtraction, and multiplication.

Imagine a simple light switch. When the switch is off, it represents a 0, and when it’s on, it represents a 1. Classical computers essentially work by flipping these switches on and off in various combinations to perform calculations.

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How Quantum Computers Process

Quantum computers, on the other hand, use quantum bits, or qubits. Qubits are fundamentally different from classical bits, as they can represent both 0 and 1 simultaneously, thanks to a principle called superposition. This allows quantum computers to process information exponentially faster and solve complex problems that are currently impossible for classical computers.

To illustrate this concept, consider a spinning coin. While the coin is in the air, it is neither heads nor tails, but a combination of both. This is akin to the superposition state of a qubit. When the coin lands, it will settle on either heads or tails, just as a qubit would collapse into a definite state upon measurement.

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The Good in Quantum Computing

Quantum computing has the potential to revolutionize many industries by solving problems that are currently too complex or time-consuming for classical computers. Some examples include:

Drug discovery: Quantum computers could help identify new pharmaceuticals by simulating the behavior of molecules and predicting their interactions with unprecedented accuracy.

Climate modeling: Quantum computing could enhance the precision of climate models, leading to better predictions and more effective strategies for addressing climate change.

Optimization problems: Quantum computers can find optimal solutions for complex problems, such as supply chain management, traffic flow optimization, and portfolio management, in a fraction of the time it would take classical computers. Artificial intelligence: Quantum computing could speed up machine learning processes and enable the development of more advanced AI systems.

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Quantum Computing and Cybersecurity

As quantum computers become more advanced, they will inevitably impact the field of cybersecurity. One of the most significant concerns is the ability of quantum computers to crack currently secure encryption methods, such as RSA and elliptic curve cryptography.

Password cracking, in particular, is a significant area of concern. In 2014, the recommended password length was eight characters, which provided a reasonable level of security against brute-force attacks. In 2023, the recommended password length has increased to twelve characters. However, even with longer passwords, the sheer processing power of quantum computers could render many existing security measures obsolete.

For instance, a quantum computer could employ Shor’s algorithm to factorize large numbers exponentially faster than a classical computer, which would break the security of RSA encryption. Similarly, Grover’s algorithm could be used to search through a vast number of possible password combinations, significantly reducing the time required to crack passwords.

To address these concerns, researchers are working on developing new cryptographic methods that can withstand attacks from quantum computers, known as post-quantum cryptography. These methods aim to provide long-term security, even in the presence of powerful quantum computers. Some promising post-quantum cryptographic approaches include lattice-based cryptography, code-based cryptography, and multivariate cryptography.

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Lattice-based cryptography: Lattice-based cryptographic schemes rely on the hardness of certain mathematical problems in lattice theory. These problems are believed to be resistant to both classical and quantum attacks. One example of a lattice-based cryptographic scheme is the Learning With Errors (LWE) problem, which has been used to develop secure encryption and digital signature schemes.

Code-based cryptography: Code-based cryptographic schemes are based on the difficulty of solving certain problems in error-correcting codes. One well-known example is the McEliece cryptosystem, which has withstood attacks from both classical and quantum computers for decades. This approach is particularly appealing due to its efficiency and relatively low computational requirements.

Multivariate cryptography: Multivariate cryptographic schemes involve solving systems of multivariate polynomial equations over finite fields. These problems are considered hard for both classical and quantum computers. Examples of multivariate cryptographic schemes include the Unbalanced Oil and Vinegar (UOV) signature scheme and the Hidden Field Equations (HFE) cryptosystem.

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While these post-quantum cryptographic methods show promise, they are still in the research and development stage, and it may take some time before they are widely adopted. In the meantime, organizations and individuals should be proactive in monitoring developments in quantum computing and updating their security measures accordingly.

Quantum computing has the potential to revolutionize various industries by making complex tasks and projects significantly simpler. However, its impact on cybersecurity, particularly password cracking, cannot be ignored. As quantum computers advance, it is crucial for researchers to continue developing post-quantum cryptographic methods to protect our digital world from potential threats. By staying informed and adapting to these changes, we can harness the power of quantum computing while mitigating its risks to cybersecurity.

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Experienced Cyber Security/Intelligence Analyst with a demonstrated history of working in the US Military and IT industry.