Europol Warns Quantum Attacks Threaten Crypto Wallets

What Is Europol Warning Us About?

Imagine a supercomputer so fast that it can solve math problems in seconds that normal computers couldn't solve in thousands of years. That is quantum computing in a nutshell.

On 7 October 2026, Europol’s European Cybercrime Centre released two new reports highlighting a major future threat to digital assets.

The law enforcement agency warned that quantum computers could eventually break the security protecting crypto wallets and sensitive user data.

How Quantum Computers Could Crack Wallet Keys

To understand the risk, it helps to look at how crypto wallets protect your money.

Every wallet relies on a pair of cryptographic keys: a public key and a private key.

Your public key is like your bank account number. Anyone can see it to send you funds. Your private key is like your secret PIN that lets you spend those funds.

Right now, complex math keeps your private key safe. It is virtually impossible for standard computers to figure out your private key from your public key.

However, a powerful quantum computer could break that mathematical lock. If an attacker gets your public key, they could calculate your private key and take your coins.

Bitcoin’s $360 Billion Vulnerability

Europol singled out Bitcoin as one of the networks facing severe quantum risk due to older wallet designs.

More than 4.3 million BTCBTC-3.41%—worth over $360 billion—sit in older Bitcoin addresses that expose public keys directly on the blockchain.

This at-risk total includes roughly 1.1 million BTC associated with Bitcoin's creator, Satoshi Nakamoto.

Modern Bitcoin addresses offer much better protection because they keep public keys hidden until a transaction occurs.

Even so, modern wallets still face a small window of risk. When you send funds, your public key becomes visible while the transaction sits waiting for network confirmation. A future quantum computer could potentially target funds during that short delay.

Beware of 'Harvest Now, Decrypt Later' Attacks

Europol’s second report explores another quiet threat known as 'harvest now, decrypt later.'

In this scenario, bad actors collect encrypted data today, even though they cannot read it yet. They store it safely on servers and wait for quantum technology to catch up.

Once quantum computers arrive, hackers can decrypt all that stored information at once.

Europol noted there is no evidence of this being done systematically on a massive scale today. Still, sensitive financial data that must remain confidential for years remains an attractive target.

Preparing for Post-Quantum Security

Europol is urging crypto developers, wallet providers, and users to start upgrading their defenses now rather than later.

The industry needs to move toward post-quantum security—new encryption methods built specifically to resist quantum attacks.

Transitioning entire blockchain networks takes time and careful testing. Starting early gives the crypto world enough room to protect assets smoothly without resorting to rushed emergency upgrades.

Past performance of digital assets or past market valuation does not guarantee future results. Crypto assets carry inherent technical and market risks.