Which term allows two parties to jointly evaluate a private function without revealing inputs?

• A. Secure Function Evaluation (SFE)
• B. Private Function Evaluation (PFE)
• C. Homomorphic Encryption
• D. Distributed Consensus

Answer: (B)

Private Function Evaluation is about two parties jointly computing the value of a function on their private inputs while keeping those inputs hidden and, crucially, keeping the function’s description itself secret from the other party. The only thing revealed is the function’s output. This makes it the best fit when both inputs must stay private and the function itself should not be disclosed. Secure Function Evaluation is related but usually assumes the function is known, focusing on protecting inputs; homomorphic encryption lets you compute on encrypted data but doesn’t inherently ensure the function remains confidential from the other party; distributed consensus isn’t about private computation at all.