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 "real time rejection and mitigation of time synchronization attacks on the global positioning system"):
  Abstract: This paper introduces the time synchronization attack rejection and mitigation (TSARM) technique for time synchronization attacks over the global positioning system (GPS). The technique estimates the clock bias and drift of the GPS receiver along with the possible attack contrary to previous approaches. Having estimated the time instants of the attack, the clock bias and drift of the receiver are corrected. The proposed technique is computationally efficient and can be easily implemented in real time in a fashion complementary to standard algorithms for position, velocity, and time estimation in off-the-shelf receivers. The performance of this technique is evaluated on a set of collected data from a real GPS receiver. Our method renders excellent time recovery consistent with the application requirements. The numerical results demonstrate that the TSARM technique outperforms competing approaches in the literature.

Includes members:
  Member "vulnerability analysis of smart grids to gps spoofing":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "fridges on the highway road traffic poisoning of navigation apps")
  Member "gnss signal authentication via power and distortion monitoring":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "requirements for secure clock synchronization")
  Member "doubly robust smoothing of dynamical processes via outlier sparsity constraints":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "iterated extended kalman smoother based variable splitting for l_1 regularized state estimation")
  Member "gnss based positioning attacks and countermeasures":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "message time of arrival codes a fundamental primitive for secure distance measurement")

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.SY(Systems and Control)