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 "csai open source cellular radio access network security analysis instrument"):
  Abstract: This paper presents our methodology and toolbox that allows analyzing the radio access network security of laboratory and commercial 4G and future 5G cellular networks. We leverage a free open-source software suite that implements the LTE UE and eNB enabling real-time signaling using software radio peripherals. We modify the UE software processing stack to act as an LTE packet collection and examination tool. This is possible because of the openness of the 3GPP specifications. Hence, we are able to receive and decode LTE downlink messages for the purpose of analyzing potential security problems of the standard. This paper shows how to rapidly prototype LTE tools and build a software-defined radio access network (RAN) analysis instrument for research and education. Using CSAI, the Cellular RAN Security Analysis Instrument, a researcher can analyze broadcast and paging messages of cellular networks. CSAI is also able to test networks to aid in the identification of vulnerabilities and verify functionality post-remediation. Additionally, we found that it can crash an eNB which motivates equivalent analyses of commercial network equipment and its robustness against denial of service attacks.

Includes members:
  Member "security and protocol exploit analysis of the 5g specifications":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "the current state of affairs in 5g security and the main remaining security challenges")
  Member "lte phy layer vulnerability analysis and testing using open source sdr tools":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "analysis of non pilot interference on link adaptation and latency in cellular networks")
  Member "performance analysis of a mission critical portable lte system in targeted rf interference":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "analysis of non pilot interference on link adaptation and latency in cellular networks")
  Member "lte security protocol exploits and location tracking experimentation with low cost software radio":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "the current state of affairs in 5g security and the main remaining security challenges")
  Member "srslte an open source platform for lte evolution and experimentation":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "pbe cc congestion control via endpoint centric physical layer bandwidth measurements")
  Member "practical attacks against privacy and availability in 4g lte mobile communication systems":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "the current state of affairs in 5g security and the main remaining security challenges")

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)