human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "blockchain for the internet of things present and future"):
  Abstract: One of the key challenges to the IoT's success is how to secure and anonymize billions of IoT transactions and devices per day, an issue that still lingers despite significant research efforts over the last few years. On the other hand, technologies based on blockchain algorithms are disrupting today's cryptocurrency markets and showing tremendous potential, since they provide a distributed transaction ledger that cannot be tampered with or controlled by a single entity. Although the blockchain may present itself as a cure-all for the IoT's security and privacy challenges, significant research efforts still need to be put forth to adapt the computation-intensive blockchain algorithms to the stringent energy and processing constraints of today's IoT devices. In this paper, we provide an overview of existing literature on the topic of blockchain for IoT, and present a roadmap of research challenges that will need to be addressed to enable the usage of blockchain technologies in the IoT.

Includes members:
  Member "machine learning for wireless communications in the internet of things a comprehensive survey":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "machine learning in the air")
  Member "block4forensic an integrated lightweight blockchain framework for forensics applications of connected vehicles":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "assuring automotive data and software integrity employing distributed hash tables and blockchain")
  Member "securing the internet of things in the age of machine learning and software defined networking":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "security privacy in iot using machine learning blockchain threats countermeasures")
  Member "smart contract based access control for the internet of things":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "scaling blockchains to support electronic health records for hospital systems")
  Member "quality of information in mobile crowdsensing survey and research challenges":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "a novel methodology for designing policies in mobile crowdsensing systems")
  Member "lsb a lightweight scalable blockchain for iot security and privacy":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "segment blockchain a size reduced storage mechanism for blockchain")
  Member "learning to detect and mitigate cross layer attacks in wireless networks framework and applications":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "machine learning for wireless communications in the internet of things a comprehensive survey")
  Member "blockchain a distributed solution to automotive security and privacy":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "assuring automotive data and software integrity employing distributed hash tables and blockchain")

Question: Please tell me which class the source paper 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)