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 "the current state of affairs in 5g security and the main remaining security challenges"):
  Abstract: The first release of the 5G protocol specifications, 3rd Generation Partnership Project (3GPP) Release 15, were published in December 2017 and the first 5G protocol security specifications in March 2018. As one of the technology cornerstones for Vehicle-to-Vehicle (V2X), Vehicle-to-Everything (V2E) systems and other critical systems, 5G defines some strict communication goals, such as massive device connectivity, sub-10ms latency and ultra high bit-rate. Likewise, given the firm security requirements of certain critical applications expected to be deployed on this new cellular communications standard, 5G defines important security goals. As such, 5G networks are intended to address known protocol vulnerabilities present in both legacy GSM (Global System for Mobile Communications) networks as well as current LTE (Long Term Evolution) mobile systems. This manuscript presents a summary and analysis of the current state of affairs in 5G protocol security, discussing the main areas that should still be improved further before 5G systems go live. Although the 5G security standard documents were released just a year ago, there is a number of research papers detailing security vulnerabilities, which are summarized in this manuscript as well.

Includes members:
  Member "security and protocol exploit analysis of the 5g specifications":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "csai open source cellular radio access network security analysis instrument")
  Member "defeating the downgrade attack on identity privacy in 5g":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "zipphone protecting user location privacy from cellular service providers")
  Member "formal analysis of 5g authentication":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "security of 5g mobile backhaul networks a survey")
  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 "csai open source cellular radio access network security analysis instrument")
  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 "csai open source cellular radio access network security analysis instrument")

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)