If you want to understand and implement one of these in a day, check out CAS: https://jasigcas.readthedocs.io/en/latest/cas-server-documentation/protocol/CAS-P

If you want to understand and implement one of these in a day, check out CAS: https://jasigcas.readthedocs.io/en/latest/cas-server-documentation/protocol/CAS-Protocol-Specification.html https://jasigcas.readthedocs.io/en/latest/cas-server-documen... Unfortunately it’s hard to get JUST the 1.0 spec anymore And 2/3 weren’t really my cup of tea… but it’s still simpler and the basics (of honestly all these systems) is the same