type: incident · created: 2026-09-05 · updated: 2026-09-05 · tags: [incident, regulation, post-quantum, g7, cryptography, policy] · confidence: high · affected_sectors: [technology, government, finance, defence] · au_impact: true
G7 Cyber Security Working Group Urges Move to Post-Quantum Cryptography
In a joint advisory released Thursday, the G7 Cyber Security Working Group and CISA urged governments and organisations to begin migrating to post-quantum cryptography now rather than waiting for sufficiently powerful quantum computers.
| Attribute | Detail |
|---|---|
| Issuers | G7 Cyber Security Working Group + CISA |
| Call | Begin PQC migration now |
| Rationale | "Harvest now, decrypt later" — attackers storing encrypted data today to decrypt once quantum machines arrive |
| Source | CISA (via digest) — Tier 1/4 |
The warning that organisations may already be exposed through harvest-now-decrypt-later makes immediate post-quantum migration a strategic necessity, especially for long-lived government, defence and financial data.