It is difficult to assert that quantum computers can "kill" Bitcoin, but there is certainly a possibility that they could threaten Bitcoin's security.

Cryptocurrencies like Bitcoin, which are based on blockchain technology, rely on encryption techniques to ensure the safety of transactions. In particular, Bitcoin uses public-key cryptography to maintain the security of users and transactions, with encryption methods such as RSA and ECDSA (Elliptic Curve Digital Signature Algorithm) playing a crucial role.

Public-key cryptography Bitcoin addresses are generated based on public keys, and users sign transactions with their private keys.

Hash functions When recording Bitcoin transactions on the blockchain, transaction data is encrypted using hash functions and included in the block.

These two core technologies ensure security based on mathematical problems that are difficult to solve with current classical computers. However, the advancement of quantum computers increases the possibility that these encryption methods could be threatened.

The main way quantum computers could threaten Bitcoin's security is through Shor's Algorithm, which can quickly solve integer factorization or digital signatures.

Does quantum computing have a secret weapon called 'Shor's Algorithm'?

Shor's Algorithm can factor integers exponentially faster than currently possible. If that becomes feasible? Theoretically, it would be possible to reverse Bitcoin's public key to its private key, allowing someone to sneakily take your Bitcoin.

But you can set your worries aside for a moment.

Currently, quantum computers are like martial arts masters still in training. They look impressive, but they lack real-world experience to go into action. Quantum bits (qubits) are often unstable and prone to errors before calculations are completed. The technology for "quantum error correction" is also not yet fully developed. So, there is no immediate threat of someone coming to crack Bitcoin keys.

Currently, quantum computers have not yet been commercialized.

In reality, quantum computers are still in their early stages of performance, with many challenges to address, such as quantum error correction and the stability of qubits. However, scientists recognize that quantum computers could potentially exhibit powerful performance that threatens encryption technology, which could become a reality in the coming years to decades.

To prepare for the threat of quantum computers, efforts are ongoing to upgrade encryption technology to quantum-safe (Post-Quantum) encryption. Quantum-safe encryption uses algorithms that cannot be solved by quantum computers, ensuring that Bitcoin can operate safely even after quantum computers are commercialized. For example, lattice-based encryption and hash-based algorithms are known to have resistance to quantum computers.

Cryptocurrencies like Bitcoin are exploring ways to transition to this quantum-safe encryption, which could be possible through software upgrades or hard forks. In other words, if encryption technology is appropriately upgraded before quantum computers are commercialized, Bitcoin can still remain secure.

While quantum computers could pose a significant threat to Bitcoin's security, the situation where they could immediately kill Bitcoin is not present. There is still a long way to go before quantum computers are commercialized, and the development of quantum-safe encryption technology is also underway. The Bitcoin community and blockchain technology experts are strengthening encryption technology in preparation for the emergence of quantum computers, ensuring that Bitcoin can continue to operate safely.

Technology continues to evolve, and the corresponding technology also evolves continuously. When Bitcoin was created in 2008, people said, "This will fail," but now it has become an asset with a market capitalization in the trillions, hasn't it?