human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Public-Key Encryption Schemes with Auxiliary Inputs"
  Abstract: We construct public-key cryptosystems that remain secure even when the adversary is given any computationally uninvertible function of the secret key as auxiliary input (even one that may reveal the secret key information-theoretically). Our schemes are based on the decisional Diffie-Hellman (DDH) and the Learning with Errors (LWE) problems.

Connected through hyperedge HE-1 (induced by source paper "Exposure-resilient functions and all-or-nothing transforms"):
  with members:
    - "Construction of extractors using pseudo-random generators (extended abstract)"

Connected through hyperedge HE-2 (induced by source paper "Practical leakage-resilient pseudorandom generators"):
  with members:
    - "Towards Fresh Re-Keying with Leakage-Resilient PRFs: Cipher Design Principles and Analysis"

Connected through hyperedge HE-3 (induced by source paper "Dual projective hashing and its applications -- lossy trapdoor functions and more"):
  with members:
    - "A unified approach to deterministic encryption: new constructions and a connection to computational entropy"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science