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 in internet of things challenges and solutions"
  Abstract: The Internet of Things IoT is experiencing exponential growth in research and industry, but it still suffers from privacy and security vulnerabilities. Conventional security and privacy approaches tend to be inapplicable for IoT, mainly due to its decentralized topology and the resource-constraints of the majority of its devices. BlockChain BC that underpin the crypto-currency Bitcoin have been recently used to provide security and privacy in peer-to-peer networks with similar topologies to IoT. However, BCs are computationally expensive and involve high bandwidth overhead and delays, which are not suitable for IoT devices. This position paper proposes a new secure, private, and lightweight architecture for IoT, based on BC technology that eliminates the overhead of BC while maintaining most of its security and privacy benefits. The described method is investigated on a smart home application as a representative case study for broader IoT applications. The proposed architecture is hierarchical, and consists of smart homes, an overlay network and cloud storages coordinating data transactions with BC to provide privacy and security. Our design uses different types of BCs depending on where in the network hierarchy a transaction occurs, and uses distributed trust methods to ensure a decentralized topology. Qualitative evaluation of the architecture under common threat models highlights its effectiveness in providing security and privacy for IoT applications.

Connected through hyperedge HE-1 (induced by source paper "security privacy in iot using machine learning blockchain threats countermeasures"):
  with members:
    - "machine learning in iot security current solutions and future challenges"
    - "on accurate and reliable anomaly detection for gas turbine combustors a deep learning approach"
    - "security services using blockchains a state of the art survey"
    - "a survey on the security of blockchain systems"
    - "secure mobile crowdsensing with deep learning"
    - "securing the internet of things in the age of machine learning and software defined networking"
    - "a first look at identity management schemes on the blockchain"
    - "blockchain as a service an autonomous privacy preserving decentralized architecture for deep learning"

Connected through hyperedge HE-2 (induced by source paper "topology aware cooperative data protection in blockchain based decentralized storage networks"):
  with members:
    - "explicit constructions of msr codes for clustered distributed storage the rack aware storage model"
    - "hierarchical coding to enable scalability and flexibility in heterogeneous cloud storage"
    - "deconstructing the blockchain to approach physical limits"
    - "the storage versus repair bandwidth trade off for clustered storage systems"
    - "rack aware regenerating codes for data centers"
    - "cooperative repair constructions of optimal mds codes for all admissible parameters"
    - "multi rack distributed data storage networks"
    - "non homogeneous two rack model for distributed storage systems"

Connected through hyperedge HE-3 (induced by source paper "authentication access control privacy threats and trust management towards securing fog computing environments a review"):
  with members:
    - "user s privacy in recommendation systems applying online social network data a survey and taxonomy"
    - "mobile edge computing fog et al a survey and analysis of security threats and challenges"
    - "fogbus a blockchain based lightweight framework for edge and fog computing"
    - "fog computing survey of trends architectures requirements and research directions"
    - "big data computing and clouds"
    - "combining ensemble methods and social network metrics for improving accuracy of ocsvm on intrusion detection in scada systems"
    - "non stationary resource allocation policies for delay constrained video streaming application to video over internet of things enabled networks"

Connected through hyperedge HE-4 (induced by source paper "markov processes in blockchain systems"):
  with members:
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "profitable double spending attacks"
    - "performance analysis of the raft consensus algorithm for private blockchains"
    - "a probabilistic model of the bitcoin blockchain"
    - "block arrivals in the bitcoin blockchain"
    - "blockchains consensus protocols in the wild"
    - "blockchain based smart contracts a systematic mapping study"
    - "an empirical analysis of smart contracts platforms applications and design patterns"

Connected through hyperedge HE-5 (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-6 (induced by source paper "blockchain and the future of the internet a comprehensive review"):
  with members:
    - "applications of blockchain technology beyond cryptocurrency"
    - "an experiment in distributed internet address management using blockchains"
    - "betrayal distrust and rationality smart counter collusion contracts for verifiable cloud computing"
    - "when the cookie meets the blockchain privacy risks of web payments via cryptocurrencies"
    - "securing vehicle to vehicle communications using blockchain through visible light and acoustic side channels"
    - "understanding modern banking ledgers through blockchain technologies future of transaction processing and smart contracts on the internet of money"
    - "online social networks threats and solutions"

Connected through hyperedge HE-7 (induced by source paper "on the convergence of blockchain and internet of things iot technologies"):
  with members:
    - "blockchain technologies for the internet of things research issues and challenges"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "analysis of the communication traffic for blockchain synchronization of iot devices"
    - "blockchain based smart contracts a systematic mapping study"
    - "proof of work without all the work"
    - "bitcoin ng a scalable blockchain protocol"
    - "majority is not enough bitcoin mining is vulnerable"

Connected through hyperedge HE-8 (induced by source paper "a journey in applying blockchain for cyberphysical systems"):
  with members:
    - "a trust architecture for blockchain in iot"
    - "trustchain trust management in blockchain and iot supported supply chains"
    - "idmob iot data marketplace on blockchain"
    - "b fica blockchain based framework for auto insurance claim and adjudication"
    - "on the activity privacy of blockchain for iot"
    - "mof bc a memory optimized and flexible blockchain for large scale networks"
    - "blockchain a distributed solution to automotive security and privacy"

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)