human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups authors who co-authored the same paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "An Improved Compression Technique for Signatures Based on Learning with Errors"):
  Abstract: We present a new approach to the compression technique of Lyubashevsky et al. [17,13] for lattice-based signatures based on learning with errors (LWE). Our ideas seem to be particularly suitable for signature schemes whose security, in the random oracle model, is based on standard worst-case computational assumptions. Our signatures are shorter than any previous proposal for provably-secure signatures based on standard lattice problems: at the 128-bit level we improve signature size from (more than) 16500 bits to around 9000 to 12000 bits.

Includes members:
  Member "High-Speed Signatures from Standard Lattices":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Compact McEliece Keys from Goppa Codes")
  Member "Fast Cryptographic Primitives and Circular-Secure Encryption Based on Hard Learning Problems":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "High-Speed Signatures from Standard Lattices")

Question: Please tell me which research area the co-authored paper (i.e., the source paper of the center hyperedge) belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Mathematics