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 "canto covert authentication with timing channels over optimized traffic flows for can"):
  Abstract: Previous research works have endorsed the use of delays and clock skews for detecting intrusions or fingerprinting ECUs on the CAN bus. Similar techniques have been also proposed for establishing a time-covert cryptographic authentication channel, in this way cleverly removing the need for cryptographic material inside the limited payload of CAN frames. The main shortcoming of such works is the limited security level that can be achieved under normal CAN-bus traffic. In this work we endeavour to test the limits of the achievable security level by relying on optimization algorithms for scheduling CAN frames. Under practical bus allocations that are based on real-world scenarios, we are able to extract around 4--5 bits of authentication data from each frame which leads to an efficient intrusion detection and authentication mechanism. By accumulating covert channel data over several consecutive frames, we can achieve higher security levels that are in line with current security demands. To prove the correctness of our approach, we present experiments on state-of-the-art automotive-grade controllers (Infineon Aurix) and bus measurements with the use of industry standard tools, i.e., CANoe.

Includes members:
  Member "tacan transmitter authentication through covert channels in controller area networks":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "covert channel based transmitter authentication in controller area networks")
  Member "viden attacker identification on in vehicle networks":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "tacan transmitter authentication through covert channels in controller area networks")
  Member "cloaking the clock emulating clock skew in controller area networks":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "tacan transmitter authentication through covert channels in controller area networks")

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.CR(Cryptography and Security)