Constructions of PRF (Pseudo Random Function)
The most common efficient PRFs from specific assumptions are:

The Naor-Reingold PRF, which is based on the decision Diffie-Hellman assumption (DDH), and

The BPR PRF, which is based on the learning with error assumption (LWE).

Perhaps slightly less well-known is the NRR PRF, which is based on the hardness of factoring.