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: "joint relay and jammer selection for secure two way relay networks"
  Abstract: In this paper, we investigate joint relay and jammer selection in two-way cooperative networks, consisting of two sources, a number of intermediate nodes, and one eavesdropper, with the constraints of physical layer security. Specifically, the proposed algorithms select two or three intermediate nodes to enhance security against the malicious eavesdropper. The first selected node operates in the conventional relay mode and assists the sources to deliver their data to the corresponding destinations using an amplify-and-forward protocol. The second and third nodes are used in different communication phases as jammers in order to create intentional interference upon the eavesdropper node. Firstly, we find that in a topology where the intermediate nodes are randomly and sparsely distributed, the proposed schemes with cooperative jamming outperform the conventional non-jamming schemes within a certain transmitted power regime. We also find that, in the scenario in which the intermediate nodes gather as a close cluster, the jamming schemes may be less effective than their non-jamming counterparts. Therefore, we introduce a hybrid scheme to switch between jamming and non-jamming modes. Simulation results validate our theoretical analysis and show that the hybrid switching scheme further improves the secrecy rate.

Connected through hyperedge HE-1 (induced by source paper "secure transmission and self energy recycling with partial eavesdropper csi"):
  with members:
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "proactive eavesdropping in relaying systems"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "secure communications in the presence of a buffer aided wireless powered relay with self energy recycling"
    - "robust an aided beamforming and power splitting design for secure miso cognitive radio with swipt"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "secure massive mimo transmission with an active eavesdropper"
    - "secure communication via a wireless energy harvesting untrusted relay"

Connected through hyperedge HE-2 (induced by source paper "on the security analysis of a cooperative incremental relaying protocol in the presence of an active eavesdropper"):
  with members:
    - "power allocation and cooperative diversity in two way non regenerative cognitive radio networks"
    - "security versus reliability analysis of opportunistic relaying"
    - "opportunistic secrecy with a strict delay constraint"
    - "intercept probability analysis of cooperative wireless networks with best relay selection in the presence of eavesdropping attack"
    - "on the design of artificial noise aided secure multi antenna transmission in slow fading channels"
    - "three receiver broadcast channels with side information"
    - "a secure communication game with a relay helping the eavesdropper"
    - "buffers improve the performance of relay selection"

Connected through hyperedge HE-3 (induced by source paper "power constrained secrecy rate maximization for joint relay and jammer selection assisted wireless networks"):
  with members:
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "joint relay and jammer selection improves the physical layer security in the face of csi feedback delays"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "multi antenna relay aided wireless physical layer security"
    - "optimization of code rates in sisome wiretap channels"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "on cooperative relaying schemes for wireless physical layer security"
    - "cooperative jamming for secure communications in mimo relay networks"

Connected through hyperedge HE-4 (induced by source paper "effective optimization criteria and relay selection algorithms for physical layer security in multiple antenna relay networks"):
  with members:
    - "widely linear precoding for large scale mimo with iqi algorithms and performance analysis"
    - "direction finding algorithms based on joint iterative subspace optimization"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "buffer aided relaying with adaptive link selection fixed and mixed rate transmission"
    - "multiuser diversity for secrecy communications using opportunistic jammer selection secure dof and jammer scaling law"
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "collaborative relay beamforming for secrecy"

Connected through hyperedge HE-5 (induced by source paper "joint relay and jammer selection improves the physical layer security in the face of csi feedback delays"):
  with members:
    - "security versus reliability analysis of opportunistic relaying"
    - "wireless physical layer security with imperfect channel state information a survey"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "cooperative jamming for secure communications in mimo relay networks"
    - "robust beamforming for security in mimo wiretap channels with imperfect csi"
    - "relay beamforming strategies for physical layer security"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"

Connected through hyperedge HE-6 (induced by source paper "study of tomlinson harashima precoding strategies for physical layer security in wireless networks"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "buffer aided relaying with adaptive link selection fixed and mixed rate transmission"
    - "multiuser diversity for secrecy communications using opportunistic jammer selection secure dof and jammer scaling law"
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "collaborative relay beamforming for secrecy"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-7 (induced by source paper "secure compute and forward transmission with artificial noise and full duplex devices"):
  with members:
    - "near optimal modulo and forward scheme for the untrusted relay channel"
    - "multi antenna relay aided wireless physical layer security"
    - "secure transmission on the two hop relay channel with scaled compute and forward"
    - "asymmetric compute and forward with csit"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "cooperative jamming for secure communications in mimo relay networks"

Connected through hyperedge HE-8 (induced by source paper "robust power allocation and outage analysis for secrecy in independent parallel gaussian channels"):
  with members:
    - "robust secure transmission in miso channels based on worst case optimization"
    - "optimal energy management policies for energy harvesting sensor nodes"

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.IT(Information Theory)