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 "vpkiaas a highly available and dynamically scalable vehicular public key infrastructure"):
  Abstract: The central building block of secure and privacy-preserving Vehicular Communication (VC) systems is a Vehicular Public-Key Infrastructure (VPKI), which provides vehicles with multiple anonymized credentials, termed pseudonyms. These pseudonyms are used to ensure message authenticity and integrity while preserving vehicle (and thus passenger) privacy. In the light of emerging large-scale multi-domain VC environments, the efficiency of the VPKI and, more broadly, its scalability are paramount. In this extended abstract, we leverage the state-of-the-art VPKI system and enhance its functionality towards a highly-available and dynamically-scalable design; this ensures that the system remains operational in the presence of benign failures or any resource depletion attack, and that it dynamically scales out, or possibly scales in, according to the requests' arrival rate. Our full-blown implementation on the Google Cloud Platform shows that deploying a VPKI for a large-scale scenario can be cost-effective, while efficiently issuing pseudonyms for the requesters.

Includes members:
  Member "a security credential management system for v2x communications":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "securing vehicle to everything v2x communication platforms")
  Member "rhythm a randomized hybrid scheme to hide in the mobile crowd":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "scaling pseudonymous authentication for large mobile systems")
  Member "secmace scalable and robust identity and credential management infrastructure in vehicular communication systems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "scaling pseudonymous authentication for large mobile systems")
  Member "evaluating on demand pseudonym acquisition policies in vehicular communication systems":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "scaling pseudonymous authentication for large mobile systems")
  Member "the key to intelligent transportation identity and credential management in vehicular communication systems":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "from data to actions in intelligent transportation systems a prescription of functional requirements for model actionability")
  Member "towards deploying a scalable robust vehicular identity and credential management infrastructure":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "resilient collaborative privacy for location based services")

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)