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: "a formal approach to cyber physical attacks"
  Abstract: We apply formal methods to lay and streamline theoretical foundations to reason about Cyber-Physical Systems (CPSs) and cyber-physical attacks. We focus on %a formal treatment of both integrity and DoS attacks to sensors and actuators of CPSs, and on the timing aspects of these attacks. Our contributions are threefold: (1) we define a hybrid process calculus to model both CPSs and cyber-physical attacks; (2) we define a threat model of cyber-physical attacks and provide the means to assess attack tolerance/vulnerability with respect to a given attack; (3) we formalise how to estimate the impact of a successful attack on a CPS and investigate possible quantifications of the success chances of an attack. We illustrate definitions and results by means of a non-trivial engineering application.

Connected through hyperedge HE-1 (induced by source paper "state of the art of cyber physical systems security an automatic control perspective"):
  with members:
    - "on redundant observability from security index to attack detection and resilient state estimation"
    - "detection of sensor attack and resilient state estimation for uniformly observable nonlinear systems having redundant sensors"
    - "analysis of stochastic switched systems with application to networked control under jamming attacks"
    - "coding schemes for securing cyber physical systems against stealthy data injection attacks"
    - "detecting integrity attacks on control systems using a moving target approach"
    - "a moving horizon hybrid stochastic game for secure control of cyber physical systems"
    - "modeling and performance evaluation of stealthy false data injection attacks on smart grid in the presence of corrupted measurements"
    - "state estimation with secrecy against eavesdroppers"

Connected through hyperedge HE-2 (induced by source paper "a roadmap toward the resilient internet of things for cyber physical systems"):
  with members:
    - "model based verification and validation of an autonomous vehicle system"
    - "deepmarks a digital fingerprinting framework for deep neural networks"
    - "mlcapsule guarded offline deployment of machine learning as a service"
    - "reachability analysis and safety verification for neural network control systems"
    - "introduction of a hybrid monitor to cyber physical systems"
    - "verification for machine learning autonomy and neural networks survey"
    - "re purposing compact neuronal circuit policies to govern reinforcement learning tasks"
    - "efficient deep learning on multi source private data"

Connected through hyperedge HE-3 (induced by source paper "learning guided network fuzzing for testing cyber physical system defences"):
  with members:
    - "detecting zero day controller hijacking attacks on the power grid with enhanced deep learning"
    - "assessing the effectiveness of attack detection at a hackfest on industrial control systems"
    - "learning from mutants using code mutation to learn and monitor invariants of a cyber physical system"
    - "anomaly detection for a water treatment system using unsupervised machine learning"
    - "log based anomaly detection of cps using a statistical method"
    - "towards concolic testing for hybrid systems"
    - "towards learning and verifying invariants of cyber physical systems by code mutation"
    - "api design for machine learning software experiences from the scikit learn project"

Connected through hyperedge HE-4 (induced by source paper "synthesis of actuator attackers for free"):
  with members:
    - "attack resilient supervisory control of discrete event systems"
    - "towards bounded synthesis of resilient supervisors against actuator attacks"
    - "supervisor obfuscation against actuator enablement attack"
    - "detection and mitigation of classes of attacks in supervisory control systems"
    - "supervisory control of discrete event systems under attacks"
    - "supervisor synthesis to thwart cyber attack with bounded sensor reading alterations"

Connected through hyperedge HE-5 (induced by source paper "towards bounded synthesis of resilient supervisors against actuator attacks"):
  with members:
    - "synthesis of successful actuator attackers on supervisors"
    - "supervisor obfuscation against actuator enablement attack"
    - "detection and mitigation of classes of attacks in supervisory control systems"
    - "supervisory control of discrete event systems under attacks"
    - "supervisor synthesis to thwart cyber attack with bounded sensor reading alterations"

Connected through hyperedge HE-6 (induced by source paper "hybrid rebeca modeling and analyzing of cyber physical systems"):
  with members:
    - "towards the modular specification and validation of cyber physical systems"
    - "a calculus of cyber physical systems"
    - "modelling and simulation of asynchronous real time systems using timed rebeca"

Connected through hyperedge HE-7 (induced by source paper "supervisor obfuscation against actuator enablement attack"):
  with members:
    - "synthesis of successful actuator attackers on supervisors"
    - "supervisory control of discrete event systems under attacks"
    - "implementing efficient all solutions sat solvers"
    - "supervisor synthesis to thwart cyber attack with bounded sensor reading alterations"

Connected through hyperedge HE-8 (induced by source paper "privacy security and trust in the internet of neurons"):
  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)