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Post-quantum migration gets harder when every user holds a key

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Post-quantum migration gets harder when every user holds a key

Christopher Smith of Quantus discusses challenges in post-quantum cryptography migration, focusing on cryptographic inventory gaps in banking and healthcare including abandoned credentials and orphaned keys. He highlights how increased post-quantum key sizes exceed assumptions in IPsec, SSH, TLS, and libp2p, and explains why migrating user-held keys complicates blockchain upgrades and detection of quantum-enabled attacks.

Why it matters: Financial institutions, healthcare providers, and distributed ledger operators need to assess their current cryptographic inventories and plan key migration strategies now, as post-quantum standards will require changes to infrastructure and processes before large-scale quantum threats emerge.

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