G7 Warns of Quantum Threat: Post-Quantum Migration Urged

The G7 cybersecurity working group has published a report urging nations and enterprises to begin transitioning to post-quantum cryptography immediately. The report, released on September 3, 2026, warns that quantum computers pose a threat to contemporary cryptography and that organizations must be ready for this risk before it becomes a reality.

The report makes no specific reference to cryptocurrency, but notes that public-key cryptography is used in the management of cryptocurrency transactions and funds. The exact timeline for the development of quantum computers capable of breaking widely used public-key cryptography mechanisms is uncertain, but recent advances suggest an anticipation of this eventuality.

One strategy mentioned in the report is gathering encrypted data today with the intention of decrypting it in the future when quantum technology is capable enough. However, this approach raises concerns about the visibility of public keys and transaction history on blockchains, which could remain visible forever and leave them vulnerable to hacking.