I am actually preparing for a cryptography exam, and I found a question asked by the professor in the class, below are the lines that I copied from the slide :
Example: Let $Ek$ be the encryption transformation of one-key cipher and $h$ be a hash function. Then $hk := Ek ◦ h$ is a keyed hash function, where $◦$ denotes the function composition.
Security: It should have good properties if both the one-key cipher and the hash function are well designed.
Write down some design requirements for the underlying hash function and one-key cipher.
I searched a lot about keyed hash functions, but I couldn't find any good article about such a design.
Can anyone help me with that?