human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "energy harvesting based secure two way communication using an untrusted relay"):
  Abstract: In this paper, we propose a two-way secure communication network where two sources exchange confidential messages via a wireless powered untrusted amplify-and-forward (AF) relay and a friendly jammer (FJ). By adopting the time switching (TS) architecture at the relay, the data transmission is accomplished in three phases. In the first phase, both the relay and FJ are charged by non-information radio frequency signals from the sources. In the second phase, the two sources transmit information signals and concurrently, the FJ transmits artificial noise to confuse the curious relay. Finally, the third phase is dedicated to forward the scaled version of the received signal from the relay to the sources. For the proposed network, we derive a new closed-form lower-bound expression for the ergodic secrecy sum rate (ESSR) in the high signal-to-noise ratio (SNR) regime. As a benchmark, we also examine the scenario of without friendly jamming (WoFJ) to highlight the performance advantages of the proposed with friendly jamming (WFJ) scenario. We further specify the high SNR slope and the high SNR power offset to determine the effect of friendly jamming on the ESSR. In the next step, novel compact closed-form expressions are derived for the intercept probability (IP) as a well-known security metric. Finally, numerical examples are provided to demonstrate the impacts of different system parameters such as energy harvesting time ratio, transmit SNR and the power allocation factor on the secrecy performance of both WFJ and WoFJ scenarios. The results illustrate that the proposed WFJ network outperforms the traditional one-way communication and the two-way WoFJ policy.

Includes members:
  Member "joint relay selection and power allocation in large scale mimo systems with untrusted relays and passive eavesdroppers":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "on maximizing information reliability in wireless powered cooperative networks")
  Member "optimal power allocation and secrecy sum rate in two way untrusted relaying":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "optimal power allocation by imperfect hardware analysis in untrusted relaying networks")
  Member "joint relay and jammer selection improves the physical layer security in the face of csi feedback delays":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "secure transmission with covert requirement in untrusted relaying networks")
  Member "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "on maximizing information reliability in wireless powered cooperative networks")
  Member "secure communication via a wireless energy harvesting untrusted relay":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "secure transmission and self energy recycling with partial eavesdropper csi")
  Member "security versus reliability analysis of opportunistic relaying":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "robust beamforming and jamming for enhancing the physical layer security of full duplex radios")
  Member "secure communication with a wireless powered friendly jammer":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "secure transmission and self energy recycling with partial eavesdropper csi")
  Member "secure beamforming for mimo two way communications with an untrusted relay":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "truth telling mechanism for secure two way relay communications with energy harvesting revenue")

Question: Please tell me which class the source paper 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)