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: "indirect file leaks in mobile applications"
  Abstract: Today, much of our sensitive information is stored inside mobile applications (apps), such as the browsing histories and chatting logs. To safeguard these privacy files, modern mobile systems, notably Android and iOS, use sandboxes to isolate apps' file zones from one another. However, we show in this paper that these private files can still be leaked by indirectly exploiting components that are trusted by the victim apps. In particular, we devise new indirect file leak (IFL) attacks that exploit browser interfaces, command interpreters, and embedded app servers to leak data from very popular apps, such as Evernote and QQ. Unlike the previous attacks, we demonstrate that these IFLs can affect both Android and iOS. Moreover, our IFL methods allow an adversary to launch the attacks remotely, without implanting malicious apps in victim's smartphones. We finally compare the impacts of four different types of IFL attacks on Android and iOS, and propose several mitigation methods.

Connected through hyperedge HE-1 (induced by source paper "scalable online vetting of android apps for measuring declared sdk versions and their consistency with api calls"):
  with members:
    - "sclib a practical and lightweight defense against component hijacking in android applications"
    - "discovering flaws in security focused static analysis tools for android using systematic mutation"
    - "mopeye opportunistic monitoring of per app mobile network performance"
    - "measuring the declared sdk versions and their consistency with api calls in android apps"
    - "mamadroid detecting android malware by building markov chains of behavioral models"
    - "analyzing android browser apps for file vulnerabilities"
    - "a sink driven approach to detecting exposed component vulnerabilities in android apps"

Connected through hyperedge HE-2 (induced by source paper "sclib a practical and lightweight defense against component hijacking in android applications"):
  with members:
    - "measuring the declared sdk versions and their consistency with api calls in android apps"
    - "analyzing android browser apps for file vulnerabilities"
    - "a sink driven approach to detecting exposed component vulnerabilities in android apps"
    - "quire lightweight provenance for smart phone operating systems"

Connected through hyperedge HE-3 (induced by source paper "measuring the declared sdk versions and their consistency with api calls in android apps"):
  with members:
    - "mopeye monitoring per app network performance with zero measurement traffic"
    - "analyzing android browser apps for file vulnerabilities"
    - "a sink driven approach to detecting exposed component vulnerabilities in android apps"

Connected through hyperedge HE-4 (induced by source paper "cross platform analysis of indirect file leaks in android and ios applications"):
  with members:
    - "analyzing android browser apps for file vulnerabilities"
    - "a sink driven approach to detecting exposed component vulnerabilities in android apps"
    - "quire lightweight provenance for smart phone operating systems"

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)