Oh good. They made up an acronym, yet managed to find one of the ones already in the heaviest (computing) use: https://en.wikipedia.org/wiki/PSP
Ok in fairness it was probably originally something like Paul's Security Protocol and they felt that that wasn't professional enough or something.
https://dl.acm.org/doi/10.1145/3708821.3710829
https://csrc.nist.gov/CSRC/media/projects/cryptographic-modu...