People working on post-quantum-proofing vulnerable encryption protocols (and curious onlookers) can find lots of value in this new post from Cloudflare. It discusses the herculean engineering challenges of revamping anonymous credentials that will be broken by a quantum computer. There's a growing need for this kind of privacy (for instance to make digital drivers licenses privacy preserving), which allows individuals to prove specific facts, like they have had a drivers license for more than 3 years, without divulging personal information like their birthday or place of birth. The long and short of of the challeng is that engineers can't simply drop quantum-resistant algorithms into AC protocols that currently use vulnerable ones. Instead, engineers will need to collaborate with standards bodies that build entirely new protocols, largely from scratch. The post goes on to name a few of the most promising approaches.

https://blog.cloudflare.com/pq-anonymous-credentials/