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 enabled enhanced iot ecosystem security"
  Abstract: Blockchain (BC), the technology behind the Bitcoin cryptocurrency system, is starting to be adopted for ensuring enhanced security and privacy in the Internet of Things (IoT) ecosystem. Fervent research is currently being focused in both academia and industry in this domain. Proof of Work (PoW), a cryptographic puzzle, plays a vital role in ensuring BC security by maintaining a digital ledger of transactions, which are considered to be incorruptible. Furthermore, BC uses a changeable Public Key (PK) to record the identity of users, thus providing an extra layer of privacy. Not only in cryptocurrency has the successful adoption of the BC been implemented, but also in multifaceted non-monetary systems, such as in: distributed storage systems, proof of location and healthcare. Recent research articles and projects or applications were surveyed to assess the implementation of the BC for IoT Security and identify associated challenges and propose solutions for BC enabled enhanced security for the IoT ecosystem.

Connected through hyperedge HE-1 (induced by source paper "blockchain enabled smart contract based applications deficiencies with the software development life cycle models"):
  with members:
    - "applications of blockchain technology beyond cryptocurrency"

Connected through hyperedge HE-2 (induced by source paper "blockchain of things bcot the fusion of blockchain and iot technologies"):
  with members:
    - "lapps technological legal and market potentials of blockchain lightning network applications"
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "challenges of internet of things and big data integration"
    - "a novel approach for network attack classification based on sequential questions"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "a survey of distributed certificate authorities in manets"
    - "internet of nano things things and everything future growth trends"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"

Connected through hyperedge HE-3 (induced by source paper "performance analytical comparison of blockchain as a service baas platforms"):
  with members:
    - "lapps technological legal and market potentials of blockchain lightning network applications"
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "applications of blockchain technology beyond cryptocurrency"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "formal specification and verification of smart contracts for azure blockchain"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "intercloud utility oriented federation of cloud computing environments for scaling of application services"

Connected through hyperedge HE-4 (induced by source paper "lapps technological legal and market potentials of blockchain lightning network applications"):
  with members:
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "applications of blockchain technology beyond cryptocurrency"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "a survey of distributed certificate authorities in manets"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "sprites and state channels payment networks that go faster than lightning"

Connected through hyperedge HE-5 (induced by source paper "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"):
  with members:
    - "applications of blockchain technology beyond cryptocurrency"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "sprites and state channels payment networks that go faster than lightning"

Connected through hyperedge HE-6 (induced by source paper "internet of things infrastructure architecture security and privacy"):
  with members:
    - "challenges of internet of things and big data integration"
    - "the rise of internet of things iot in big healthcare data review and open research issues"
    - "treatment of reactive routing protocols using second chance based on malicious behavior of nodes in manets"
    - "a review on internet of things iot internet of everything ioe and internet of nano things iont"

Connected through hyperedge HE-7 (induced by source paper "applications of blockchain technology beyond cryptocurrency"):
  with members:
    - "internet of nano things things and everything future growth trends"
    - "a review on internet of things iot internet of everything ioe and internet of nano things iont"

Connected through hyperedge HE-8 (induced by source paper "application of blockchain in booking and registration systems of securities exchanges"):
  with members:
    - "applications of blockchain technology beyond cryptocurrency"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"

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)