G7 Sounds Quantum Alarm as Bitcoin and Ethereum Weigh Defences

What happened

On 3 September 2026, the G7 Cybersecurity Working Group released a report urging governments and organizations to start using post-quantum cryptography immediately. The report warned that attackers can already collect encrypted data now and decrypt it later when powerful quantum computers become available.

Confirmed

Global impact / market context

Bitcoin and Ethereum rely on current encryption to protect digital wallets and transactions. If quantum computers can break that encryption, holdings could become vulnerable. This warning pushes these networks to upgrade their security systems, which requires significant development and coordination across the industry.

Analyst inference

This report adds a new risk factor for cryptocurrency investors. The possibility of future security flaws might affect confidence in Bitcoin and Ethereum's long-term safety. Since these are the two largest digital assets, any perceived weakness in their defenses could influence broader digital currency markets and related investments.

Analyst inference

What to watch

1. Watch whether governments and organizations actually begin moving to post-quantum cryptography soon after this G7 report, since the report urged them to act immediately rather than delay. Confirmed
2. Proposal: Monitor announcements from Bitcoin and Ethereum development teams about plans to adopt post-quantum security measures, as these would directly address the G7's warning about future decryption threats. Proposed
3. Watch for discussions among crypto exchanges and wallet providers about safeguarding user funds, since they manage large amounts of Bitcoin and Ethereum and would need to respond to any security upgrade. Analyst inference

Affected assets

• ETH — Ethereum
• BTC — Bitcoin

Evidence

• coinpaprika.com