human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "anap anonymous authentication protocol in mobile ad hoc networks"
  Abstract: The pervasiveness of wireless communication recently gave mobile ad hoc networks (MANET) a significant researcher’s attention, due to its innate capabilities of instant communication in many time and mission critical applications. However, its natural advantages of networking in civilian and military environments make them vulnerable to security threats. Support for an anonymity in MANET is an orthogonal to security critical challenge we faced in this paper. We propose a new anonymous authentication protocol for mobile ad hoc networks enhanced with a distributed reputation system. The main its objective is to provide mechanisms concealing a real identity of communicating nodes with an ability of resist to known attacks. The distributed reputation system is incorporated for a trust management and malicious behavior detection in the network. The end-to-end anonymous authentication is conducted in three-pass handshake based on an asymmetric and symmetric key cryptography. After successfully finished authentication phase secure and multiple anonymous data channels are established. The anonymity is guarantied by randomly chosen pseudonyms owned by a user. Nodes of the network are publicly identified and are independent of users’ pseudonyms. In this paper we presented an example of the protocol implementation.

Connected through hyperedge HE-1 (induced by source paper "secmon end to end quality and security monitoring system"):
  with members:
    - "new security and control protocol for voip based on steganography and digital watermarking"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CR(Cryptography and Security)