[Just to give an example that I should have given yesterday for anyone who finds this in the future, in particular if you omit some of the safeguards of SRP the

[Just to give an example that I should have given yesterday for anyone who finds this in the future, in particular if you omit some of the safeguards of SRP then the “core” of it has h(V, s) = V^s (mod N) for some N and in some sense it is not doing full public key crypto but rather the seemingly-weaker subset that is Diffie-Hellman key exchange. But of course then ElGamal came and proved that at the core of Diffie-Hellman you can find a public key crypto algorithm so they are clearly very strongly related to each other even if this doesn't need to use the full force of it.]