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 "cloud storage forensics analysis of data remnants on spideroak justcloud and pcloud"):
  Abstract: Abstract   Storage as a Service (STaaS) cloud platform benefits such as getting access to data anywhere, anytime, on a wide range of devices made them very popular among businesses and individuals. As such forensics investigators are increasingly facing cases that involve investigation of STaaS platforms. Therefore it is essential for cyber investigators to know how to collect, preserve, and analyze evidences of these platforms. In this paper we describe the investigation of three STaaS platforms namely SpiderOak, JustCloud, and pCloud on Windows 8.1 and iOS 8.1.1 devices. Moreover, possible changes on uploaded and downloaded files metadata on these platforms would be tracked and their forensics value would be investigated.

Includes members:
  Member "ubuntu one investigation detecting evidences on client machines":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "forensic investigation of p2p cloud storage bittorrent sync as a case study")
  Member "digital forensic investigation of cloud storage services":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "greening cloud enabled big data storage forensics syncany as a case study")
  Member "cloud storage forensic hubic as a case study":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "greening cloud enabled big data storage forensics syncany as a case study")
  Member "mobile cloud forensics an analysis of seven popular android apps":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "ubuntu one investigation detecting evidences on client machines")
  Member "using smartphones as a proxy for forensic evidence contained in cloud storage services":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "a bleeding digital heart identifying residual data generation from smartphone applications interacting with medical devices")

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)