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silverpill@silverpill@mitra.social (2026-04-14 20:35:11)
Recent advancements in quantum computing pose a threat to systems where identity is derived from a public key, such as blockchains:

https://blog.succinct.xyz/google-quantum-ai-paper-crypto/

FEP-ef61 currently uses did:key identities, which are also derived from public keys. They are supposed to be permanent, so to avoid costly migrations in the future we need to offer an option compatible with post-quantum signatures.

I opened an issue about adding such option to did:key specification: https://github.com/w3c-ccg/did-key-spec/issues/74

The downside of post-quantum signatures, however, is that they require very long keys. This means object URIs are also going to be very long.

did:webvh may be a good alternative to did:key if URI length becomes a problem.
---Reply---
silverpill@silverpill@mitra.social (2026-04-23 18:29:00)
Quantum-Safe Cryptosuites v0.3

https://w3c-ccg.github.io/di-quantum-safe