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 "forensics analysis of android mobile voip apps"):
  Abstract: Voice over Internet Protocol (VoIP) applications (apps) provide convenient and low cost means for users to communicate and share information with each other in real-time. Day by day, the popularity of such apps is increasing, and people produce and share a huge amount of data, including their personal and sensitive information. This might lead to several privacy issues, such as revealing user contacts, private messages or personal photos. Therefore, having an up-to-date forensic understanding of these apps is necessary. This chapter presents analysis of forensically valuable remnants of three popular Mobile VoIP (mVoIP) apps on Google Play store, namely: Viber, Skype, and WhatsApp Messenger, in order to figure out to what extent these apps reveal forensically valuable information about the users activities. We performed a thorough investigative study of these three mVoIP apps on smartphone devices. Our experimental results show that several artefacts, such as messages, contact details, phone numbers, images, and video files, are recoverable from the smartphone device that is equipped with these mVoIP apps.

Includes members:
  Member "windows instant messaging app forensics facebook and skype as case studies":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "greening cloud enabled big data storage forensics syncany as a case study")
  Member "on the feasibility of attribute based encryption on smartphone devices":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "a cyber kill chain based taxonomy of banking trojans for evolutionary computational intelligence")
  Member "a forensically sound adversary model for mobile devices":
    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 "forensic taxonomy of popular android mhealth apps":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "a bleeding digital heart identifying residual data generation from smartphone applications interacting with medical devices")
  Member "mobile cloud forensics an analysis of seven popular android apps":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "ubuntu one investigation detecting evidences on client machines")
  Member "conceptual evidence collection and analysis methodology for android devices":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "ubuntu one investigation detecting evidences on client machines")
  Member "privacy risks in mobile dating apps":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "dating with scambots understanding the ecosystem of fraudulent dating applications")
  Member "forensic analysis of whatsapp messenger on android smartphones":
    also connected through other hyperedges:
      - Hyperedge HE-8 (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)