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: "Cryptography and game theory: designing protocols for exchanging information"
  Abstract: The goal of this paper is finding fair protocols for the secret sharing and secure multiparty computation (SMPC) problems, when players are assumed to be rational.

It was observed by Halpern and Teague (STOC 2004) that protocols with bounded number of iterations are susceptible to backward induction and cannot be considered rational. Previously suggested cryptographic solutions all share the property of having an essential exponential upper bound on their running time, and hence they are also susceptible to backward induction.

Although it seems that this bound is an inherent property of every cryptography based solution, we show that this is not the case. We suggest coalition-resilient secret sharing and SMPC protocols with the property that after any sequence of iterations it is still a computational best response to follow them. Therefore, the protocols can be run any number of iterations, and are immune to backward induction.

The mean of communication assumed is a broadcast channel, and we consider both the simultaneous and non-simultaneous cases.

Connected through hyperedge HE-1 (induced by source paper "Blazing Fast 2PC in the Offline/Online Setting with Security for Malicious Adversaries"):
  with members:
    - "Non-Interactive Secure Computation Based on Cut-and-Choose"
    - "More Efficient Constant-Round Multi-party Computation from BMR and SHE"

Connected through hyperedge HE-2 (induced by source paper "Games for exchanging information"):
  with members:
    (none)

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: Mathematics