Quantum computing is still in the laboratory

• Quantum computing is a slowly evolving research field.

• Although IBM opened its Quantum Computing facility for commercial use in 2019, a meaningful quantum computer for general-purpose use has yet to be developed.

• When I search the Internet with the phrase 'cybersecurity and quantum computing', I get many results that suggest present-day cybersecurity would be under deep threat in the era of quantum computing.

• What does it mean to the security and safety of online financial services, which heavily depend on public-key cryptography?

It sounds rather sad but it is an apparent truth that cybersecurity and quantum computing may not seem to become technology allies.

Quantum computing envisages a superpower for the modern world

• The one trait that distinguishes traditional computers from a quantum computer is their enormous computing power.

• A quantum computer can be exponentially more powerful than the fastest digital computing machines ever existed in the world.

Quantum Computers would be having tremendous computing power

• Quantum bits or qubits are the heart of this power.

• The digital bits are binary, which can have a value of either one or zero, whereas the qubits can exist in multiple states simultaneously.

The superpower of quantum computers can lead to many breakthroughs in science, life-saving medical advances, and financial strategies to live well in retirement, etc.

But quantum computing can be a real threat to cryptography and present-day cybersecurity

• Quantum computing can be a real threat to cryptography, on which the present-day online financial transactions dwell.

Is quantum computing a real threat to the present day cybersecurity?

• A quantum computer can decode/break security passwords of today's online cryptosystems based on RSA cryptographic algorithms, which are mostly the backbone of the FinTech applications. 

• RSA's encryption key is public, but the decryption key is kept secret (private key).

The security of the RSA algorithm is based on the fact that classical computers can't factorize the product of two large prime numbers within finite time.

• In theory, a quantum computer can reverse factorize the large prime numbers, also known as "one-way codes," within a finite span of time.

The research report explains how "A powerful quantum computer could crack RSA-1024 and RSA-2048, the popular algorithmic defense for this process, in less than a day".

Would the entire password and authentication security domain be under threat?

• It is almost clear that quantum computers can indirectly break text passwords.

But can quantum computers also crack non-text graphical passwords?

• Can quantum computers break non-text graphical pass images similar to the Expanded Password Systems proposed by Hitoshi Kokumai?

• I would like to pose this question to the learned quantum computing specialists, who are deeply involved in developing real-world applications of quantum computing.

Can quantum computing guess a graphical image?

• This topic is likely an active research area in the real-world applications of quantum computing.

To the best of my knowledge and belief, I haven't found any reference that describes the possibility of decoding graphical passwords by a meaningful quantum computer.

What would be the fate of the blockchain and the decentralized domain in the quantum era?

• Can quantum computing kill the security of decentralized applications of blockchain and distributed computing?

• Would cryptocurrency projects suffer when general-purpose quantum computers become available?

As per research reports and commentaries on quantum computing, it seems that the cryptocurrency domain would be completely jeopardized when a sufficiently powered general-purpose quantum computer is built.

What about quantum computing-resistant cryptography?

• Although the current versions of quantum computers don't have sufficient qubits to decode the security encryption of the present-day cryptosystems, the future versions of quantum computers would have the power to crack passwords within a finite time.

Is it possible to have quantum computing resistant cybersecurity?

• It is indeed a requirement that future cyber-physical systems incorporate quantum computing-resistant designs of data security.

I would like to know how the security community is getting prepared with cybersecurity designs for the future quantum computing era.

Are you afraid or elated about quantum computing?

Almost every country's government is having a quantum mission, vision, and strategic plans.

• What about you as an individual?

• What are your thoughts?

Are you afraid or elated about quantum computing?

• Depending on our knowledge and thinking power, we as individuals have a role to play.

• Don't just see, read, and get elated, or go away out of fear from the topic of quantum computing.

If possible, put some effort to adopt a quantum computing resistant strategy.

• Just think it over.

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About me

I am a researcher who contributes to the overlapping areas of STEAM (Science, Technology, Engineering, Arts, and Mathematics). I am an active user and promoter of GNU/Linux, free and open-source software. I also develop cybersecurity and information security solutions, specifically graphical authentication security.

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Debesh Choudhury

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Wednesday, December 24, 2025

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