𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭 𝐦𝐞𝐚𝐬𝐮𝐫𝐞𝐬 𝐚𝐜𝐭𝐢𝐯𝐢𝐭𝐲. 𝐄𝐥𝐢𝐦𝐢𝐧𝐚𝐭𝐢𝐨𝐧 𝐦𝐞𝐚𝐬𝐮𝐫𝐞𝐬 𝐩𝐫𝐨𝐠𝐫𝐞𝐬𝐬.

This week I read the best description of how to measure success against quantum risk. It comes from a recent Department of War (DoW) strategy document, and it is a breath of fresh air.

𝐈 𝐪𝐮𝐨𝐭𝐞: "Quantum resistance is not achieved when PQC is rolled out, but when quantum-vulnerable solutions are deprecated."

Let's dissect what that means because it cuts straight through the marketing theatre dominating cybersecurity right now.

𝐃𝐞𝐟𝐢𝐧𝐞:"Quantum-Vulnerable"

Any algorithm or system relying on classical mathematics such as RSA or ECC that a cryptographically relevant quantum computer can break. If an adversary can intercept your data today and decrypt it tomorrow, or forge trust in the future, it is quantum-vulnerable.

𝐃𝐞𝐟𝐢𝐧𝐞: "Solutions"

A solution is not just software or an algorithm library. It is the entire cryptographic ecosystem: HSMs, PKI and trust chains, entropy sources, embedded firmware and supply-chain dependencies.

𝐃𝐞𝐟𝐢𝐧𝐞: "Deprecated"

Deprecated does not mean running something new alongside something old. It means deactivated, removed and prohibited. If a legacy fallback remains, it is not deprecated.

Therefore, "Hybrid" Won't Work

Running PQC alongside legacy cryptography is a transition strategy, not an end state. If classical algorithms remain available, they remain part of the attack surface. A quantum-vulnerable dependency anywhere in the lifecycle means the risk still exists.

𝐖𝐡𝐚𝐭 𝐈𝐬 𝐄𝐱𝐩𝐥𝐢𝐜𝐢𝐭𝐥𝐲 𝐎𝐮𝐭 𝐨𝐟 𝐒𝐜𝐨𝐩𝐞?

The DoW strategy is clear about what does not count as quantum resistance:

No Quantum Theatre: QKD, quantum networking and non-local quantum randomness generation.

No Band-Aids: Larger RSA key sizes, PSK schemes and PQC proxy solutions.

There is no magic hardware patch or networking trick that avoids the need for real infrastructure transformation.

𝐓𝐡𝐞 𝐁𝐨𝐭𝐭𝐨𝐦 𝐋𝐢𝐧𝐞

Turning on the new maths is the easy part. The real challenge is the systematic removal of decades of cryptographic debt. A mission thread is only quantum-resistant when no vulnerable algorithm survives anywhere across the ecosystem.

𝐃𝐨𝐧'𝐭 𝐚𝐬𝐤 𝐰𝐡𝐚𝐭 𝐲𝐨𝐮'𝐯𝐞 𝐢𝐧𝐬𝐭𝐚𝐥𝐥𝐞𝐝. 𝐀𝐬𝐤 𝐰𝐡𝐚𝐭 𝐲𝐨𝐮'𝐯𝐞 𝐞𝐥𝐢𝐦𝐢𝐧𝐚𝐭𝐞𝐝.

#Cybersecurity #Cryptography #PostQuantum #PQC #InfoSec #EnterpriseArchitecture #RiskManagement