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Strong pre-shared keys will continue to remain secure, even against a quantum computer.

Wireguard, for example, provides the ability to add a pre-shared key for endpoints, which it mixes in during key exchange. Wireguard sessions collected under such a configuration should remain safe when attacked by a future quantum computer, assuming that the shared keys remain secret.

Pre-shared keys are just inconvenient to handle safely.

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> Pre-shared keys are just inconvenient to handle safely.

You can transfer PSKs safely and easily with OpenSSH 9.0 (released 2022-04-08) or later, which uses sntrup761x25519-sha512@openssh.com as the default key exchange method.

If your threat model includes someone with a quantum computer intercepting all of your traffic and storing it to decrypt later, you probably don't want to share your keys over a non-PQC channel unless you can guarantee that they haven't started eavesdropping on your traffic yet.

While sntrup761x25519-sha512 is a QC secure key exchange, sending a key over it doesn't count. It's not really a "pre-shared" key unless the sharing is done using organic, locally sourced sneakers. Unless FIPs, and then it's boots.

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