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: "cooperation with an untrusted relay a secrecy perspective"
  Abstract: We consider the communication scenario where a source-destination pair wishes to keep the information secret from a relay node despite wanting to enlist its help. For this scenario, an interesting question is whether the relay node should be deployed at all. That is, whether cooperation with an untrusted relay node can ever be beneficial. We first provide an achievable secrecy rate for the general untrusted relay channel, and proceed to investigate this question for two types of relay networks with orthogonal components. For the first model, there is an orthogonal link from the source to the relay. For the second model, there is an orthogonal link from the relay to the destination. For the first model, we find the equivocation capacity region and show that answer is negative. In contrast, for the second model, we find that the answer is positive. Specifically, we show, by means of the achievable secrecy rate based on compress-and-forward, that by asking the untrusted relay node to relay information, we can achieve a higher secrecy rate than just treating the relay as an eavesdropper. For a special class of the second model, where the relay is not interfering itself, we derive an upper bound for the secrecy rate using an argument whose net effect is to separate the eavesdropper from the relay. The merit of the new upper bound is demonstrated on two channels that belong to this special class. The Gaussian case of the second model mentioned above benefits from this approach in that the new upper bound improves the previously known bounds. For the Cover-Kim deterministic relay channel, the new upper bound finds the secrecy capacity when the source-destination link is not worse than the source-relay link, by matching with achievable rate we present.

Connected through hyperedge HE-1 (induced by source paper "secure relaying in non orthogonal multiple access trusted and untrusted scenarios"):
  with members:
    - "secrecy sum rate maximization in non orthogonal multiple access"
    - "on the spectral efficiency and security enhancements of noma assisted multicast unicast streaming"
    - "enhancing the physical layer security of non orthogonal multiple access in large scale networks"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"

Connected through hyperedge HE-2 (induced by source paper "design and performance analysis of secure multicasting cooperative protocol for wireless sensor network applications"):
  with members:
    - "optimal power allocation by imperfect hardware analysis in untrusted relaying networks"

Connected through hyperedge HE-3 (induced by source paper "learning an adversary s actions for secret communication"):
  with members:
    - "first and second order asymptotics in covert communication"
    - "generalizing multiple access wiretap and wiretap ii channel models achievable rates and cost of strong secrecy"
    - "a new wiretap channel model and its strong secrecy capacity"
    - "arbitrarily varying wiretap channels with type constrained states"
    - "semantic security capacity for wiretap channels of type ii"
    - "list decoding random coding exponents and expurgated exponents"
    - "capacity results for arbitrarily varying wiretap channels"
    - "regret analysis of stochastic and nonstochastic multi armed bandit problems"

Connected through hyperedge HE-4 (induced by source paper "a reputation based stackelberg game model to enhance secrecy rate in spectrum leasing to selfish iot devices"):
  with members:
    - "spectrum sharing in cooperative cognitive radio networks a matching game framework"
    - "a secure communication game with a relay helping the eavesdropper"

Connected through hyperedge HE-5 (induced by source paper "physical layer service integration in 5g potentials and challenges"):
  with members:
    - "fundamental green tradeoffs progresses challenges and impacts on 5g networks"
    - "an overview of sustainable green 5g networks"
    - "gsvd based precoding in mimo systems with integrated services"
    - "robust artificial noise aided transmit design for multi user miso systems with integrated services"
    - "wireless powered communication opportunities and challenges"
    - "multi antenna relay aided wireless physical layer security"
    - "enhancing wireless information and power transfer by exploiting multi antenna techniques"
    - "simultaneous wireless information and power transfer in modern communication systems"

Connected through hyperedge HE-6 (induced by source paper "secure video streaming in heterogeneous small cell networks with untrusted cache helpers"):
  with members:
    - "on the optimality of separation between caching and delivery in general cache networks"
    - "cache enabled physical layer security for video streaming in backhaul limited cellular networks"
    - "wireless caching technical misconceptions and business barriers"
    - "caching in the sky proactive deployment of cache enabled unmanned aerial vehicles for optimized quality of experience"
    - "on edge caching with secrecy constraints"
    - "energy efficiency of downlink networks with caching at base stations"
    - "cross layer optimization of fast video delivery in cache enabled relaying networks"
    - "5g ultra dense cellular networks"

Connected through hyperedge HE-7 (induced by source paper "on secure communication using rf energy harvesting two way untrusted relay"):
  with members:
    - "interference aided energy harvesting cognitive relaying with multiple primary transceivers"
    - "secure communication via a wireless energy harvesting untrusted relay"
    - "joint power splitting and secure beamforming design in the wireless powered untrusted relay networks"
    - "secure communication via an untrusted non regenerative relay in fading channels"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "wireless information and power transfer in two way amplify and forward relaying channels"
    - "wireless information and power transfer architecture design and rate energy tradeoff"
    - "robust beamforming for wireless information and power transmission"

Connected through hyperedge HE-8 (induced by source paper "secret key aided scheme for securing untrusted df relaying networks"):
  with members:
    - "achievable rates of buffer aided full duplex gaussian relay channels"
    - "protecting against untrusted relays an information self encrypted approach"
    - "capacity of the gaussian two hop full duplex relay channel with residual self interference"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "experiment driven characterization of full duplex wireless systems"
    - "on the delay limited secrecy capacity of fading channels"

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)