TLDR

Vitalik Buterin warned that quantum computers could break the cryptography protecting Bitcoin and Ethereum as early as 2028.
Buterin emphasized that elliptic curve cryptography, the foundation of blockchain security, is particularly vulnerable to quantum threats.
Google and Microsoft’s recent breakthroughs in quantum computing have intensified concerns over the future of blockchain security.
Quantum researcher Scott Aaronson confirmed that a fault-tolerant quantum computer could exist before the 2028 U.S. elections.
Bitcoin developer Théau Peronnin advised that Bitcoin must undergo a hard fork by 2030 to integrate stronger quantum-proof protection.

Vitalik Buterin, the creator of Ethereum, warned developers in Buenos Aires that quantum computers could break the cryptography behind Bitcoin and other major cryptocurrencies as soon as 2028. He emphasized that elliptic curve cryptography, the math that underpins the security of most blockchains today, is particularly vulnerable. As quantum computing technology advances rapidly, the risks to blockchain security grow more urgent, with experts predicting a potential breakthrough within a few years.

Ethereum Faces Risks from Quantum Computing Advances

Buterin highlighted that quantum computers could undermine Ethereum’s security, just as they could Bitcoin’s. “Elliptic curves are going to die,” he said, referencing the cryptographic technique securing digital wallets and transactions. He pointed out that, once fully developed, quantum computers could exploit weaknesses in the system.

The fears intensified after Google’s recent quantum computing achievement, followed by Microsoft’s unveiling of a quantum chip earlier this year. Researchers like Scott Aaronson have confirmed that rapid advances in quantum technology make it possible for a fault-tolerant quantum computer to exist before the 2028 U.S. elections. Aaronson also warned that Shor’s algorithm, which could break blockchain encryption, is a real threat as the hardware matures.

Vitalik Buterin also addressed the future of Bitcoin’s security. Théau Peronnin, CEO of Alice & Bob, cautioned that Bitcoin developers have limited time to prepare. He believes Bitcoin must undergo a hard fork by 2030 to integrate stronger post-quantum cryptography. The clock is ticking for Bitcoin’s developers, and as quantum computers continue to evolve, they must act swiftly.

Peronnin’s warnings also stress the need for urgent action. “Developers should have a few good years ahead, but I wouldn’t hold Bitcoin long-term,” he said. The quantum threat could expose outdated wallets and keys, leaving them vulnerable once quantum computers reach sufficient scale.

Vitalik Buterin Emphasizes Urgency of Quantum-Proofing Ethereum

As Ethereum moves toward quantum-proofing its system, Vitalik Buterin outlined a strategy. He suggested that Ethereum’s consensus layer could freeze earlier, while the Ethereum Virtual Machine remains flexible. This approach allows the blockchain to adapt while ensuring safety amid evolving threats.

Vitalik believes that Ethereum’s strength lies in its ability to innovate in Layer 2 solutions. Layer 2 rollups, wallets, and privacy tools are all seen as essential in shielding the main Ethereum chain from quantum threats. However, this shift to Layer 2 comes with trade-offs, especially as Ethereum evolves to balance flexibility and security.

Vitalik Buterin’s statements underline the urgency for blockchain developers. The clock is ticking on quantum-resistant technologies, and the crypto community must act swiftly to secure digital assets against future quantum threats.

The post Vitalik Buterin Warns Quantum Computers Could Break Blockchain by 2028 appeared first on Blockonomi.

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Filed under: Bitcoin - @ November 19, 2025 11:22 pm