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 a distributed solution to automotive security and privacy"
  Abstract: Interconnected smart vehicles offer a range of sophisticated services that benefit the vehicle owners, transport authorities, car manufacturers and other service providers. This potentially exposes smart vehicles to a range of security and privacy threats such as location tracking or remote hijacking of the vehicle. In this article, we argue that BlockChain (BC), a disruptive technology that has found many applications from cryptocurrencies to smart contracts, is a potential solution to these challenges. We propose a BC-based architecture to protect the privacy of the users and to increase the security of the vehicular ecosystem. Wireless remote software updates and other emerging services such as dynamic vehicle insurance fees, are used to illustrate the efficacy of the proposed security architecture. We also qualitatively argue the resilience of the architecture against common security attacks.

Connected through hyperedge HE-1 (induced by source paper "assuring automotive data and software integrity employing distributed hash tables and blockchain"):
  with members:
    - "secure ota software updates in connected vehicles a survey"
    - "block4forensic an integrated lightweight blockchain framework for forensics applications of connected vehicles"
    - "blockchain based trust authentication for decentralized sensor networks"

Connected through hyperedge HE-2 (induced by source paper "creating efficient blockchains for the internet of things by coordinated satellite terrestrial networks"):
  with members:
    - "optimizing space air ground integrated networks by artificial intelligence"
    - "bitcoin ng a scalable blockchain protocol"

Connected through hyperedge HE-3 (induced by source paper "integration of blockchain and cloud of things architecture applications and challenges"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "blockchain technologies for the internet of things research issues and challenges"
    - "a survey on consensus mechanisms and mining strategy management in blockchain networks"
    - "designing a blockchain based iot with ethereum swarm and lora the software solution to create high availability with minimal security risks"
    - "energy crowdsourcing and peer to peer energy trading in blockchain enabled smart grids"
    - "bpds a blockchain based privacy preserving data sharing for electronic medical records"
    - "a survey on the security of blockchain systems"
    - "wip a novel blockchain based trust model for cloud identity management"

Connected through hyperedge HE-4 (induced by source paper "blockchain for the internet of things present and future"):
  with members:
    - "machine learning for wireless communications in the internet of things a comprehensive survey"
    - "block4forensic an integrated lightweight blockchain framework for forensics applications of connected vehicles"
    - "securing the internet of things in the age of machine learning and software defined networking"
    - "smart contract based access control for the internet of things"
    - "quality of information in mobile crowdsensing survey and research challenges"
    - "lsb a lightweight scalable blockchain for iot security and privacy"
    - "learning to detect and mitigate cross layer attacks in wireless networks framework and applications"
    - "providing privacy safety and security in iot based transactive energy systems using distributed ledgers"

Connected through hyperedge HE-5 (induced by source paper "blockchain technologies for the internet of things research issues and challenges"):
  with members:
    - "a survey on the security of blockchain systems"
    - "a delay tolerant payment scheme based on the ethereum blockchain"
    - "towards trusted social networks with blockchain technology"
    - "a survey on security and privacy issues of bitcoin"
    - "an empirical analysis of linkability in the monero blockchain"
    - "teechain a secure asynchronous blockchain payment network"
    - "from pretty good to great enhancing pgp using bitcoin and the blockchain"
    - "ipfs content addressed versioned p2p file system"

Connected through hyperedge HE-6 (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 in internet of things challenges and solutions"

Connected through hyperedge HE-7 (induced by source paper "impact of consensus on appendable block blockchain for iot"):
  with members:
    - "the ico phenomenon and its relationships with ethereum smart contract environment"
    - "a survey on security and privacy issues of bitcoin"
    - "privacy preserving and efficient aggregation based on blockchain for power grid communications in smart communities"
    - "mof bc a memory optimized and flexible blockchain for large scale networks"
    - "be selfish and avoid dilemmas fork after withholding faw attacks on bitcoin"
    - "majority is not enough bitcoin mining is vulnerable"

Connected through hyperedge HE-8 (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 based intelligent vehicle data sharing framework"
    - "securing vehicle to vehicle communications using blockchain through visible light and acoustic side channels"

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)