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: "all your bulbs are belong to us investigating the current state of security in connected lighting systems"
  Abstract: ZigBee Light Link (ZLL) is the low-power mesh network standard used by connected lighting systems, such as Philips Hue, Osram Lightify, and GE Link. These lighting systems are intended for residential use but also deployed in hotels, restaurants, and industrial buildings. In this paper, we investigate the current state of security in ZLL-based connected lighting systems. We extend the scope of known attacks by describing novel attack procedures to show that the ZLL standard is insecure by design. Using our penetration testing framework, we are able to take full control over all three systems mentioned above. Besides novel attack procedures, we also extend the intended wireless range of max. 2 meters for configuring a ZLL device to over 30 meters, thus making ZLL-based systems susceptible to war driving. We conclude with a discussion about the security needs of connected lighting systems and derive several lessons for Internet of Things security that can be learned from the insecure design of ZLL-based connected lighting systems.

Connected through hyperedge HE-1 (induced by source paper "the security of smart buildings a systematic literature review"):
  with members:
    - "privacy policy negotiation in social media"
    - "analysis of human awareness of security and privacy threats in smart environments"
    - "visualizing bacnet data to facilitate humans in building security decision making"

Connected through hyperedge HE-2 (induced by source paper "deployment optimization of iot devices through attack graph analysis"):
  with members:
    - "internet of things applications and challenges in technology and standardization"

Connected through hyperedge HE-3 (induced by source paper "oops i think i scanned a malware"):
  with members:
    - "bitwhisper covert signaling channel between air gapped computers using thermal manipulations"
    - "thermal covert channels on multi core platforms"
    - "on covert acoustical mesh networks in air"
    - "airhopper bridging the air gap between isolated networks and mobile phones using radio frequencies"

Connected through hyperedge HE-4 (induced by source paper "iotscanner detecting and classifying privacy threats in iot neighborhoods"):
  with members:
    - "internet of things iot a vision architectural elements and future directions"

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)