
Somewhere right now, encrypted data belonging to your organisation is very possibly being copied and stored by someone who cannot read it yet. That is the entire premise of harvest now, decrypt later, and two governments have just put binding migration deadlines around the assumption that this is already happening.
The Threat Nobody Can See Happening
Harvest now, decrypt later works in three stages: an adversary intercepts and stores encrypted traffic today, holds onto it, and waits for quantum computing to mature enough to break the encryption later. The NSA, CISA and NIST have all warned that this is already happening rather than a future scenario, with government communications, healthcare and genomic records, financial transaction histories and long-lived proprietary research flagged as the categories of data most exposed, precisely because their value does not expire when the encryption eventually does. The unsettling part is that an organisation has no way of knowing whether its own traffic has already been harvested. There is no breach notification for data that was quietly copied rather than stolen outright, years before anyone could do anything with it.
Two Governments, Two Deadlines, One Shared Conclusion
The United States moved first. NIST finalised its first post-quantum cryptography standards in August 2024, and the NSA’s CNSA 2.0 framework now requires quantum-safe algorithms on all new national security systems from January 2027, full application migration by 2030, and complete infrastructure migration by 2035. The UK’s National Cyber Security Centre published its own roadmap in March 2025, structured differently but arriving at the same endpoint: identify and plan by 2028, execute high-priority upgrades between 2028 and 2031, and complete migration across all systems, services and products by 2035. Two governments, working independently, converged on the same twenty-year horizon and the same conclusion that this cannot be left until quantum computers actually arrive.
Why the Slow Timeline Is the Argument, Not the Excuse
It would be easy to read a 2035 deadline as a reason to defer this for years. That reading gets the risk backwards. Cryptographic migration across a large organisation’s systems, vendors and data stores typically takes five to ten years to execute properly, which means an organisation starting its inventory and planning today is already working to a tight schedule against either government’s timeline, rather than a comfortable one. Industry analysts project the post-quantum cryptography market will exceed 15 billion dollars by 2030, and enterprises are being advised to allocate 2 to 5 per cent of annual security spend to migration over a four-year window. The bottleneck was never algorithm development. NIST has already published the standards. The bottleneck is inventory, sequencing and the unglamorous, multi-year discipline of finding every system that needs to change.
What a PMO Should Do With This Now
Post-quantum migration belongs on a technology roadmap as its own workstream, rather than folded quietly into general infrastructure refresh budgets where it will lose priority against anything more visible. The first deliverable is not a pilot project. It is an inventory: which systems, vendors and data categories carry encryption that needs to survive into the 2030s, ranked by how long that data needs to stay confidential. Anything meant to remain secret beyond 2030 is already, by definition, running on borrowed time.
On 19 September, the extortion group ShinyHunters broke into the dark web leak site run by Cl0p, one of the most prolific ransomware operations of the past two years, and defaced it. Three days later Cl0p was still trying to regain control, and every company that quietly paid Cl0p to make a breach disappear had a new, uncomfortable question to answer.






