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: "analyzing android browser apps for file vulnerabilities"
  Abstract: Securing browsers in mobile devices is very challenging, because these browser apps usually provide browsing services to other apps in the same device. A malicious app installed in a device can potentially obtain sensitive information through a browser app. In this paper, we identify four types of attacks in Android, collectively known as FileCross, that exploits the vulnerable file:// to obtain users' private files, such as cookies, bookmarks, and browsing histories. We design an automated system to dynamically test 115 browser apps collected from Google Play and find that 64 of them are vulnerable to the attacks. Among them are the popular Firefox, Baidu and Maxthon browsers, and the more application-specific ones, including UC Browser HD for tablet users, Wikipedia Browser, and Kids Safe Browser. A detailed analysis of these browsers further shows that 26 browsers (23%) expose their browsing interfaces unintentionally. In response to our reports, the developers concerned promptly patched their browsers by forbidding file:// access to private file zones, disabling JavaScript execution in file:// URLs, or even blocking external file:// URLs. We employ the same system to validate the ten patches received from the developers and find one still failing to block the vulnerability.

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"
    - "indirect file leaks in mobile applications"
    - "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"
    - "indirect file leaks in mobile applications"
    - "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"
    - "indirect file leaks in mobile applications"
    - "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:
    - "indirect file leaks in mobile applications"
    - "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)