The Internet is undergoing a significant transition towards post-quantum (PQ) cryptography to safeguard against potential quantum attacks, with particular focus on transitioning systems like TLS connections to PQ alternatives. While PQ cryptographic algorithms have increased costs, making them challenging to integrate seamlessly, efforts are progressing, such as Cloudflare's work on TLS and Anonymous Credentials (ACs), which address privacy issues by allowing users to prove specific attributes without revealing excessive personal information. The European Union's upcoming digital identity wallet and Cloudflare's rate-limiting applications are examples of real-world AC deployments, yet the migration to PQ alternatives remains complex due to the need for new cryptographic primitives, such as lattices or hash functions, that can ensure security against quantum threats. The blog discusses various PQ techniques, including zero-knowledge proofs and multi-party computations, but highlights the lack of efficient, standardized zero-knowledge-friendly hash functions as a significant barrier. The article calls for industry and academic collaboration to develop robust post-quantum protocols that address practical needs, such as per-origin rate-limiting and stateful credentials, to prepare for a post-quantum world.