[Polizeiposaune]

It appears to be referred to as the "Paddywhack Security Protocol" in some documents:

https://dl.acm.org/doi/10.1145/3708821.3710829

https://csrc.nist.gov/CSRC/media/projects/cryptographic-modu...

https://github.com/opencomputeproject/OCP-NET-Falcon

[IshKebab]

Good sleuthing. What a weird name, I wonder where it came from. The nursery rhyme somehow?