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: "survey on security issues in cloud computing and associated mitigation techniques"
  Abstract: Computing holds the potential to eliminate the requirements for setting up of high-cost computing infrastructure for IT-based solutions and services that the industry uses. It promises to provide a flexible IT architecture, accessible through internet from lightweight portable devices. This would allow multi-fold increase in the capacity and capabilities of the existing and new software. In a cloud computing environment, the entire data resides over a set of networked resources, enabling the data to be accessed through virtual machines. Since these data-centres may be located in any part of the world beyond the reach and control of users, there are multifarious security and privacy challenges that need to be understood and addressed. Also, one can never deny the possibility of a server breakdown that has been witnessed, rather quite often in the recent times. There are various issues that need to be addressed with respect to security and privacy in a cloud computing environment. This extensive survey paper aims to elaborate and analyze the numerous unresolved issues threatening the cloud computing adoption and diffusion affecting the various stake-holders associated with it. Keywordsas a Service (SaaS), Platform as a Service (PaaS), Infrastructure as a Service (IaaS), Interoperability, Denial of Service (DoS), Distributed Denial of Service (DDoS), Mobile Cloud Computing (MCC), Optical Character Recognition (OCR), Community of Interest (COI).

Connected through hyperedge HE-1 (induced by source paper "survey on security issues in file management in cloud computing environment"):
  with members:
    - "sleep deprivation attack detection in wireless sensor network"
    - "a new trusted and collaborative agent based approach for ensuring cloud security"

Connected through hyperedge HE-2 (induced by source paper "securing cloud from cloud drain"):
  with members:
    - "rism reputation based intrusion detection system for mobile ad hoc networks"
    - "inter cloud data security strategies"
    - "cloud computing an approach with modern cryptography"
    - "a survey on security issues in cloud computing"
    - "a novel multipath approach to security in mobile ad hoc networks manets"
    - "a new trusted and collaborative agent based approach for ensuring cloud security"

Connected through hyperedge HE-3 (induced by source paper "data hiding and retrieval using permutation index method"):
  with members:
    - "compchall addressing password guessing attacks"

Connected through hyperedge HE-4 (induced by source paper "a heuristic reputation based system to detect spam activities in a social networking platform hrsssnp"):
  with members:
    - "rism reputation based intrusion detection system for mobile ad hoc networks"
    - "a new trusted and collaborative agent based approach for ensuring cloud security"
    - "security scheme for distributed dos in mobile ad hoc networks"
    - "a semi distributed reputation based intrusion detection system for mobile adhoc networks"
    - "compchall addressing password guessing attacks"

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)