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: "blockchain based intelligent vehicle data sharing framework"
  Abstract: The Intelligent vehicle (IV) is experiencing revolutionary growth in research and industry, but it still suffers from many security vulnerabilities. Traditional security methods are incapable to provide secure IV data sharing. The major issues in IV data sharing are trust, data accuracy and reliability of data sharing data in the communication channel. Blockchain technology works for the crypto currency, Bit-coin, which is recently used to build trust and reliability in peer-to-peer networks having similar topologies as IV Data sharing. In this paper, we have proposed Intelligent Vehicle data sharing we are proposing a trust environment based Intelligent Vehicle framework. In proposed framework, we have use the blockchain technology as backbone of the IV data-sharing environment. The blockchain technology is provide the trust environment between the vehicles with the based on proof of driving.

Connected through hyperedge HE-1 (induced by source paper "onionchain towards balancing privacy and traceability of blockchain based applications"):
  with members:
    - "zebralancer private and anonymous crowdsourcing system atop open blockchain"
    - "an empirical analysis of linkability in the monero blockchain"
    - "intelligent vehicle trust point reward based intelligent vehicle communication using blockchain"
    - "blockchain a distributed solution to automotive security and privacy"
    - "securing vehicle to vehicle communications using blockchain through visible light and acoustic side channels"

Connected through hyperedge HE-2 (induced by source paper "dmap a distributed blockchain based framework for online mapping in smart city"):
  with members:
    - "speedychain a framework for decoupling data from blockchain for smart cities"
    - "blockchain a distributed solution to automotive security and privacy"
    - "using block chain for peer to peer proof of location"

Connected through hyperedge HE-3 (induced by source paper "towards secure blockchain enabled internet of vehicles optimizing consensus management using reputation and contract theory"):
  with members:
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "speedychain a framework for decoupling data from blockchain for smart cities"
    - "review of blockchain technology and its expectations case of the energy sector"
    - "incentive mechanism design for wireless energy harvesting based internet of things"
    - "intelligent vehicle trust point reward based intelligent vehicle communication using blockchain"
    - "evolutionary game for mining pool selection in blockchain networks"
    - "decentralized computation offloading game for mobile cloud computing"

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)