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: "demo of bandana body area network device to device authentication using natural gait"
  Abstract: We demonstrate the BANDANA gait-based ad-hoc device pairing scheme. Our quantization approach extracts binary fingerprints from the deviation of acceleration sequences representing instantaneous gait vs. mean gait and establishes identical keys for fingerprints generated at distinct locations on the same body via a fuzzy commitment scheme. The separation between device-pairs on same-body and distinct body is possible as the fingerprint similarity exceeds 70% for same-body device pairs but on average reaches only 50% (random guess) for different body device pairs. The application of the BANDANA ad-hoc pairing will be demonstrated on a pair of Nexus 5X android phones and with a Huawei Watch 2.

Connected through hyperedge HE-1 (induced by source paper "perils of zero interaction security in the internet of things"):
  with members:
    - "on the secrecy of publicly observable biometric features security properties of gait for mobile device pairing"
    - "survey and systematization of secure device pairing"
    - "re run repeat reproduce reuse replicate transforming code into scientific contributions"
    - "walk unlock zero interaction authentication protected with multi modal gait biometrics"
    - "the internet of things new interoperability management and security challenges"
    - "sound proof usable two factor authentication based on ambient sound"
    - "context aware computing for the internet of things a survey"

Connected through hyperedge HE-2 (induced by source paper "h2b heartbeat based secret key generation using piezo vibration sensors"):
  with members:
    - "cheepsync a time synchronization service for resource constrained bluetooth le advertisers"
    - "from physical to cyber escalating protection for personalized auto insurance"

Connected through hyperedge HE-3 (induced by source paper "survey and systematization of secure device pairing"):
  with members:
    - "rapid user transparent and trustworthy device pairing for d2d enabled mobile crowdsourcing"
    - "walk unlock zero interaction authentication protected with multi modal gait biometrics"
    - "challenges in mobile multi device ecosystems"
    - "when theory and reality collide demystifying the effectiveness of ambient sensing for nfc based proximity detection by applying relay attack data"
    - "stash securing transparent authentication schemes using prover side proximity verification"
    - "contextual proximity detection in the face of context manipulating adversaries"
    - "pitfalls in designing zero effort deauthentication opportunistic human observation attacks"
    - "on covert acoustical mesh networks in air"

Connected through hyperedge HE-4 (induced by source paper "security properties of gait for mobile device pairing"):
  with members:
    - "vnect real time 3d human pose estimation with a single rgb camera"
    - "it s the human that matters accurate user orientation estimation for mobile computing applications"

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)