Quantum Threat Looms Over Crypto Sooner Than Expected

New research shows crypto encryption can be cracked by quantum computers much faster than previously thought, putting trillions in assets at risk.

Apr. 11, 2026 at 2:10pm

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A highly detailed, glowing 3D illustration of a quantum computer processor, with intricate circuits and neon lights, conceptually representing the powerful but threatening impact of quantum computing on crypto security.As quantum computing advances rapidly, the race is on to secure the $2 trillion crypto ecosystem against the looming threat of quantum attacks.Stanford Today

A new 57-page white paper from Google's DeepMind Research Center, Google's Quantum AI division, Stanford University, and the Ethereum Foundation has revealed that cryptocurrency encryption can be cracked by quantum computers far sooner than expected, putting over $2 trillion in crypto assets at risk of being stolen. The paper argues that Shor's algorithm running on a fault-tolerant quantum machine could theoretically reduce the timeline for cracking 256-bit encryption from billions of years to just minutes, and that the gap is closing 20 times faster than the industry assumed.

Why it matters

This quantum threat to crypto security is emerging faster than most in the industry anticipated, with over 1.7 million Bitcoin and 6.9 million across all protocols already vulnerable to quantum attacks due to exposed public keys. The entire $600 billion-plus Ethereum ecosystem also faces multiple attack vectors. Preparing the global crypto ecosystem for a post-quantum world will require a massive cryptographic migration, presenting both risks and opportunities for investors and companies.

The details

The paper shows that current blockchain security relies on elliptic curve cryptography, which classical computers would need billions of years to crack. However, quantum computers using Shor's algorithm could theoretically reduce that timeline to single-digit minutes. While current quantum processors don't have enough stable qubits to pull this off yet, the paper argues the gap is closing 20 times faster than expected, similar to the rapid progress seen in AI. Over $2 trillion in crypto assets are at risk, including 1.7 million Bitcoin in old addresses with exposed public keys, and 6.9 million Bitcoin across all protocols with reused public keys - amounting to 33% of all Bitcoin in existence. Ethereum also faces five distinct attack vectors targeting its accounts, admin functions, smart contracts, consensus mechanism, and data availability layer.

  • The Google DeepMind / Stanford paper was published on April 11, 2026.
  • NIST finalized its first set of post-quantum encryption standards in 2024.

The players

Google DeepMind Research Center

A leading artificial intelligence research company and subsidiary of Alphabet, Google's parent company.

Google Quantum AI

The quantum computing division of Google focused on developing practical quantum technologies.

Stanford University

A prestigious private research university located in California, known for its strengths in computer science and cryptography.

Ethereum Foundation

The non-profit organization responsible for overseeing the development of the Ethereum blockchain platform.

Silvio Micali

A Turing Award-winning cryptographer from MIT who designed the Algorand blockchain with forward-looking security architecture.

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What they’re saying

“This wasn't some amateur blog post or anonymous chirping in a comment section. This was a coordinated, peer-level warning from three of the most credible institutions in technology and cryptography.”

— Jonathan Rose, Author

What’s next

The U.S. Department of Defense, the NSA, and major financial institutions are actively auditing their cryptographic infrastructure to prepare for the quantum threat. Governments and institutions are moving to adopt post-quantum encryption standards finalized by NIST in 2024.

The takeaway

The emerging quantum threat to crypto security is arriving faster than expected, putting over $2 trillion in assets at risk. Preparing the global crypto ecosystem for a post-quantum world will require a massive cryptographic migration, presenting both risks and opportunities for investors and companies. The Algorand blockchain, designed with forward-looking security in mind, may be well-positioned to capitalize on this shift.