Quantum Computers Could Be a Big Problem for Blockchain Security

Blockchain technology might soon face a major threat—not from hackers or government regulations, but from the rise of quantum computing.

As quantum computers become more advanced, they could break the encryption that keeps blockchain networks like Bitcoin secure. Some experts, like cryptographer Kostas Chalkias, believe that the crypto world is not taking this risk seriously enough. He warns that when quantum computers become powerful enough, they won’t go after smaller or newer blockchains—they’ll target the biggest and most vulnerable ones first.

Why Bitcoin Might Be the First to Get Hit

Bitcoin is at the top of the list of potential targets. It’s not just because it’s the most popular cryptocurrency, but because of how its cryptography has been used over time. Many old Bitcoin wallets have already shown their public keys on the blockchain, including some that may belong to Bitcoin’s mysterious creator, Satoshi Nakamoto.

This is a big deal because Bitcoin uses ECDSA signatures, a type of cryptography that quantum computers are expected to crack in the future. Since public keys are already visible on-chain, attackers wouldn’t need new transactions to steal old coins—they could simply break the existing cryptography.

Chalkias points out that this makes Bitcoin more exposed than newer blockchains, which can more easily switch to updated security measures.

Quantum Threats Might Come Sooner Than Expected

For years, many in the crypto space thought quantum computing wouldn’t be a problem until sometime in the 2030s. While that timeline might still hold, Chalkias warns that we can’t count on slow progress. Artificial intelligence and other technologies could speed things up unexpectedly.

Governments are already preparing for this. Organizations like NIST (National Institute of Standards and Technology) are pushing for new post-quantum cryptography standards. Chalkias says blockchain developers should be doing the same—before it’s too late.

Why Sui Says It’s Ready for Quantum Attacks

Unlike older networks like Bitcoin and Ethereum, Sui was built with future threats in mind. Instead of using ECDSA, Sui uses EdDSA cryptography, which makes it easier to upgrade to quantum-resistant systems later on.

Even better, Sui’s team at Mysten Labs has created a simple method for users to move their existing accounts to a post-quantum system using zero-knowledge proofs. This kind of upgrade isn’t possible on Ethereum or Solana because of how those blockchains were originally designed.

Still, despite these advanced features, Sui hasn’t cracked the top 40 cryptocurrencies by market cap. Ethereum is funding some research into quantum safety, and Solana is exploring new types of addresses, but overall, the crypto world is still in early stages when it comes to quantum security.

SUI Price Action: Holding Ground After Pullback

From a trading point of view, SUI’s price is showing signs of stabilization rather than panic.

SUI is currently hovering around $1.49 after dropping from above $2.00 earlier this year. Most of January’s gains have been erased, but the price has now settled into a sideways range instead of continuing to fall.

Technical indicators show that selling pressure might be cooling off. The 4-hour Relative Strength Index (RSI) is around 38, climbing up from oversold levels. This usually means that bearish momentum is slowing down. Meanwhile, the MACD histogram is becoming less negative, hinting at a potential short-term price recovery.

Key support lies between $1.45 and $1.40—if the price drops below this zone, it could lead to deeper losses. On the flip side, resistance levels are around $1.60 and $1.75 if buyers return.

Right now, SUI seems to be in a holding pattern—consolidating and waiting for its next move. Whether its long-term focus on quantum resistance will drive future demand remains uncertain. But for now, the market appears to be finding its footing rather than falling apart.

Keywords: blockchain security, quantum computing threat, Bitcoin vulnerability, ECDSA vs EdDSA, post-quantum cryptography, Sui blockchain, zero-knowledge proofs, SUI price analysis, crypto market trends, quantum-safe blockchain networks.