Major Claim By ISARA (need to research this organization, ISARA) [re: HSS & XMSS - Ideal for Roots of Trust]
"Hierarchical Signature Scheme (HSS) and eXtended Merkle Signature Scheme (XMSS) are based on a mature area of mathematics and are well trusted to be used for digital signatures today. They are not part of the NIST PQC Standardization process but will be approved for specific use cases, like code-signing and certificate-signing. While they generally perform better than elliptic curve cryptography (ECC), they have one drawback: a large stateful private key.
By working closely with our HSM partners, we’ve solved the state management problem making these schemes ready for quantum-safe roots of trust in code and certificate signing today."
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