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: "idmob iot data marketplace on blockchain"
  Abstract: Today, Internet of Things (IoT) devices are the powerhouse of data generation with their ever-increasing numbers and widespread penetration. Similarly, artificial intelligence (AI) and machine learning (ML) solutions are getting integrated to all kinds of services, making products significantly more "smarter". The centerpiece of these technologies is "data". IoT device vendors should be able keep up with the increased throughput and come up with new business models. On the other hand, AI/ML solutions will produce better results if training data is diverse and plentiful. In this paper, we propose a blockchain-based, decentralized and trustless data marketplace where IoT device vendors and AI/ML solution providers may interact and collaborate. By facilitating a transparent data exchange platform, access to consented data will be democratized and the variety of services targeting end-users will increase. Proposed data marketplace is implemented as a smart contract on Ethereum blockchain and Swarm is used as the distributed storage platform.

Connected through hyperedge HE-1 (induced by source paper "on the convergence of artificial intelligence and distributed ledger technology a scoping review and future research agenda"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "energy recycling blockchain with proof of deep learning"
    - "decentralized and collaborative ai on blockchain"
    - "sok transparent dishonesty front running attacks on blockchain"
    - "reliable federated learning for mobile networks"
    - "keystone an open framework for architecting tees"
    - "tensorscone a secure tensorflow framework using intel sgx"
    - "coin ai a proof of useful work scheme for blockchain based distributed deep learning"

Connected through hyperedge HE-2 (induced by source paper "energy aware demand selection and allocation for real time iot data trading"):
  with members:
    - "towards secure and decentralized sharing of iot data"
    - "a conceptual marketplace model for iot generated personal data"
    - "enforcing private data usage control with blockchain and attested off chain contract execution"
    - "a decentralized iot data marketplace"
    - "mind my value a decentralized infrastructure for fair and trusted iot data trading"
    - "blockchain enabled data marketplace design and challenges"
    - "distributed approximation algorithms for the multiple knapsack problem"
    - "allocation of heterogeneous resources of an iot device to flexible services"

Connected through hyperedge HE-3 (induced by source paper "wibson protocol for secure data exchange and batch payments"):
  with members:
    - "secure exchange of digital goods in a decentralized data marketplace"
    - "wibson a decentralized data marketplace"

Connected through hyperedge HE-4 (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"
    - "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"
    - "blockchain in internet of things challenges and solutions"

Connected through hyperedge HE-5 (induced by source paper "a distributed ledger based infrastructure for smart transportation system and social good"):
  with members:
    - "likestarter a smart contract based social dao for crowdfunding"
    - "on the ethereum blockchain structure a complex networks theory perspective"
    - "a blockchain based flight data recorder for cloud accountability"
    - "towards blockchain based auditable storage and sharing of iot data"
    - "ipfs content addressed versioned p2p file system"

Connected through hyperedge HE-6 (induced by source paper "a decentralized iot data marketplace"):
  with members:
    - "mind my value a decentralized infrastructure for fair and trusted iot data trading"
    - "sensor search techniques for sensing as a service architecture for the internet of things"
    - "sensing as a service model for smart cities supported by internet of things"

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)