Post-quantum migration gets harder when every user holds a key
Quantus CEO Christopher Smith discusses post-quantum migration pitfalls, including oversized keys breaking IPsec, SSH and TLS, and hard-to-migrate blockchain user keys.
Quantus CEO Christopher Smith describes post-quantum migration findings from banks and hospitals, including forgotten default passwords, orphaned admin keys held by former employees and hidden password hashes on user devices. Larger post-quantum keys and signatures break size assumptions in IPsec, SSH, TLS and libp2p, while migrating blockchain user keys remains hard because every user must act. He argues boards should fund quantum migration like insurance by quantifying cryptographic failure risk, and warns a silent quantum break would be difficult to detect from outside.
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