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: "securing vehicle to vehicle communications using blockchain through visible light and acoustic side channels"
  Abstract: Autonomous and self-driving vehicles are appearing on the public highways. These vehicles commonly use wireless communication techniques for both vehicle-to-vehicle and vehicle-to-infrastructure communications. Manufacturers, regulators and the public are understandably concerned about large-scale systems failure or malicious attack via these wireless vehicular networks. This paper explores the use of sensing and signalling devices that are commonly integrated into modern vehicles for side-channel communication purposes. Visible light (using a CMOS camera) and acoustic (ultrasonic audio) side-channel encoding techniques are proposed, developed and evaluated in this context. The side-channels are examined both theoretically and experimentally and an upper bound on the line code modulation rate that is achievable with these side channel schemes in the vehicular networking context is established. A novel inter-vehicle session key establishment protocol, leveraging both side-channels and a blockchain public key infrastructure, is then presented. In light of the limited channel capacity and the interoperability/security requirements for vehicular communications, techniques for constraining the throughput requirement, providing device independence and validating the location of the intended recipient vehicle, are presented. These reduce the necessary device handshake throughput to 176 bits for creating symmetric encryption and message authentication keys and in verifying a vehicle's certificate with a recognised certification authority.

Connected through hyperedge HE-1 (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"
    - "blockchain a distributed solution to automotive security and privacy"

Connected through hyperedge HE-2 (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"
    - "blockchain in internet of things challenges and solutions"
    - "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-3 (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 a distributed solution to automotive security and privacy"
    - "blockchain based intelligent vehicle data sharing framework"

Connected through hyperedge HE-4 (induced by source paper "biometric blockchain a secure solution for intelligent vehicle data sharing"):
  with members:
    - "3dpalsynet a facial palsy grading and motion recognition framework using fully 3d convolutional neural networks"
    - "blockchain a distributed solution to automotive security and privacy"

Connected through hyperedge HE-5 (induced by source paper "mof bc a memory optimized and flexible blockchain for large scale networks"):
  with members:
    - "towards blockchain based auditable storage and sharing of iot data"
    - "lsb a lightweight scalable blockchain for iot security and privacy"
    - "secure and trustable electronic medical records sharing using blockchain"
    - "a smart home is no castle privacy vulnerabilities of encrypted iot traffic"
    - "blockchain a distributed solution to automotive security and privacy"

Connected through hyperedge HE-6 (induced by source paper "blockchain inspired event recording system for autonomous vehicles"):
  with members:
    - "blackchain scalability for resource constrained accountable vehicle to x communication"
    - "strong federations an interoperable blockchain solution to centralized third party risks"
    - "the miner s dilemma"

Connected through hyperedge HE-7 (induced by source paper "intelligent vehicle trust point reward based intelligent vehicle communication using blockchain"):
  with members:
    - "blockchain a distributed solution to automotive security and privacy"

Connected through hyperedge HE-8 (induced by source paper "blockchain based intelligent vehicle data sharing framework"):
  with members:
    - "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)