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 trust authentication for decentralized sensor networks"
  Abstract: Sensor networks and Wireless Sensor Networks (WSN) are key components for the development of the Internet of Things. These networks are subject of two kinds of constraints. Adaptability by the mean of mutability and evolutivity, and constrained node resources such as energy consumption, computational complexity or memory usage. In this context, none of the existing protocols and models allows reliable peer authentication and trust level management. In the field of virtual economic transactions, Bitcoin has proposed a new decentralized and evolutive way to model and acknowledge trust and data validity in a peer network by the mean of the blockchain. We propose a new security model and its protocol based on the blockchain technology to ensure validity and integrity of cryptographic authentication data and associate peer trust level, from the beginning to the end of the sensor network lifetime.

Connected through hyperedge HE-1 (induced by source paper "anchoring the value of cryptocurrency"):
  with members:
    - "decentralization in bitcoin and ethereum networks"
    - "towards scaling blockchain systems via sharding"
    - "dissecting ponzi schemes on ethereum identification analysis and impact"
    - "smart contract templates foundations design landscape and research directions"
    - "majority is not enough bitcoin mining is vulnerable"
    - "market oriented cloud computing vision hype and reality for delivering it services as computing utilities"
    - "cloud computing and grid computing 360 degree compared"

Connected through hyperedge HE-2 (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 a distributed solution to automotive security and privacy"

Connected through hyperedge HE-3 (induced by source paper "towards blockchain based multi agent robotic systems analysis classification and applications"):
  with members:
    - "a reference architecture for smart and software defined buildings"
    - "interacting with the internet of things using smart contracts and blockchain technologies"
    - "controlling robots using artificial intelligence and a consortium blockchain"
    - "blockchain solutions for multi agent robotic systems related work and open questions"
    - "towards the internet of robotic things analysis architecture components and challenges"
    - "robochain a secure data sharing framework for human robot interaction"
    - "an architecture for distributed ledger based m2m auditing for electric autonomous vehicles"
    - "smart contracts for multiagent plan execution in untrusted cyber physical systems"

Connected through hyperedge HE-4 (induced by source paper "security services using blockchains a state of the art survey"):
  with members:
    - "a survey on security and privacy issues of bitcoin"
    - "towards blockchain based auditable storage and sharing of iot data"
    - "using blockchain and smart contracts for secure data provenance management"
    - "a blockchain based approach for data accountability and provenance tracking"
    - "blockbench a framework for analyzing private blockchains"
    - "bitcoin ng a scalable blockchain protocol"

Connected through hyperedge HE-5 (induced by source paper "wip a novel blockchain based trust model for cloud identity management"):
  with members:
    - "beyond the hype on using blockchains in trust management for authentication"

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)