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: "lte security protocol exploits and location tracking experimentation with low cost software radio"
  Abstract: The Long Term Evolution (LTE) is the latest mobile standard being implemented globally to provide connectivity and access to advanced services for personal mobile devices. Moreover, LTE networks are considered to be one of the main pillars for the deployment of Machine to Machine (M2M) communication systems and the spread of the Internet of Things (IoT). As an enabler for advanced communications services with a subscription count in the billions, security is of capital importance in LTE. Although legacy GSM (Global System for Mobile Communications) networks are known for being insecure and vulnerable to rogue base stations, LTE is assumed to guarantee confidentiality and strong authentication. However, LTE networks are vulnerable to security threats that tamper availability, privacy and authentication. This manuscript, which summarizes and expands the results presented by the author at ShmooCon 2016 \cite{jover2016lte}, investigates the insecurity rationale behind LTE protocol exploits and LTE rogue base stations based on the analysis of real LTE radio link captures from the production network. Implementation results are discussed from the actual deployment of LTE rogue base stations, IMSI catchers and exploits that can potentially block a mobile device. A previously unknown technique to potentially track the location of mobile devices as they move from cell to cell is also discussed, with mitigations being proposed.

Connected through hyperedge HE-1 (induced by source paper "the current state of affairs in 5g security and the main remaining security challenges"):
  with members:
    - "security and protocol exploit analysis of the 5g specifications"
    - "defeating the downgrade attack on identity privacy in 5g"
    - "formal analysis of 5g authentication"
    - "srslte an open source platform for lte evolution and experimentation"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"

Connected through hyperedge HE-2 (induced by source paper "csai open source cellular radio access network security analysis instrument"):
  with members:
    - "security and protocol exploit analysis of the 5g specifications"
    - "lte phy layer vulnerability analysis and testing using open source sdr tools"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"
    - "srslte an open source platform for lte evolution and experimentation"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"

Connected through hyperedge HE-3 (induced by source paper "security and protocol exploit analysis of the 5g specifications"):
  with members:
    - "defeating the downgrade attack on identity privacy in 5g"
    - "formal analysis of 5g authentication"
    - "the 5g aka authentication protocol privacy"
    - "lte phy layer vulnerability analysis and testing using open source sdr tools"
    - "extending lte into the unlicensed spectrum technical analysis of the proposed variants"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"
    - "five disruptive technology directions for 5g"

Connected through hyperedge HE-4 (induced by source paper "5g nr jamming spoofing and sniffing threat assessment and mitigation"):
  with members:
    - "lte phy layer vulnerability analysis and testing using open source sdr tools"
    - "on error correction performance and implementation of polar code list decoders for 5g"
    - "performance analysis of a mission critical portable lte system in targeted rf interference"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"
    - "vulnerability of lte to hostile interference"

Connected through hyperedge HE-5 (induced by source paper "on security research towards future mobile network generations"):
  with members:
    - "lte phy layer vulnerability analysis and testing using open source sdr tools"
    - "control flow integrity precision security and performance"
    - "srslte an open source platform for lte evolution and experimentation"
    - "retrofitting mutual authentication to gsm using rand hijacking"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"
    - "improving air interface user privacy in mobile telephony"
    - "vulnerability of lte to hostile interference"

Connected through hyperedge HE-6 (induced by source paper "easy 4g lte imsi catchers for non programmers"):
  with members:
    - "srslte an open source platform for lte evolution and experimentation"
    - "practical attacks against privacy and availability in 4g lte mobile communication systems"

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.CR(Cryptography and Security)