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: "stress testing the booters understanding and undermining the business of ddos services"
  Abstract: DDoS-for-hire services, also known as booters, have commoditized DDoS attacks and enabled abusive subscribers of these services to cheaply extort, harass and intimidate businesses and people by knocking them offline. However, due to the underground nature of these booters, little is known about their underlying technical and business structure. In this paper we empirically measure many facets of their technical and payment infrastructure. We also perform an analysis of leaked and scraped data from three major booters---Asylum Stresser, Lizard Stresser and VDO---which provides us with an in-depth view of their customers and victims. Finally, we conduct a large-scale payment intervention in collaboration with PayPal and evaluate its effectiveness. Based on our analysis we show that these services are responsible for hundreds of thousands of DDoS attacks and identify potentially promising methods of increasing booters' costs and undermining these services.

Connected through hyperedge HE-1 (induced by source paper "ddos hide seek on the effectiveness of a booter services takedown"):
  with members:
    - "a long way to the top significance structure and stability of internet top lists"
    - "amplification and drdos attack defense a survey and new perspectives"

Connected through hyperedge HE-2 (induced by source paper "tranco a research oriented top sites ranking hardened against manipulation"):
  with members:
    - "structure and stability of internet top lists"
    - "an automated approach to auditing disclosure of third party data collection in website privacy policies"
    - "herding vulnerable cats a statistical approach to disentangle joint responsibility for web security in shared hosting"
    - "on the ubiquity of web tracking insights from a billion page web crawl"
    - "the effect of dns on tor s anonymity"
    - "exposing the hidden web an analysis of third party http requests on 1 million websites"

Connected through hyperedge HE-3 (induced by source paper "autobotcatcher blockchain based p2p botnet detection for the internet of things"):
  with members:
    - "hybrid iot hybrid blockchain architecture for internet of things pow sub blockchains"
    - "decentralizing privacy enforcement for internet of things smart objects"
    - "peerhunter detecting peer to peer botnets through community behavior analysis"
    - "enigma decentralized computation platform with guaranteed privacy"

Connected through hyperedge HE-4 (induced by source paper "mapping the underground towards automatic discovery of cybercrime supply chains"):
  with members:
    - "taxogen unsupervised topic taxonomy construction by adaptive term embedding and clustering"
    - "identifying products in online cybercrime marketplaces a dataset for fine grained domain adaptation"
    - "xgboost a scalable tree boosting system"

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)