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: "adsplit separating smartphone advertising from applications"
  Abstract: A wide variety of smartphone applications today rely on third-party advertising services, which provide libraries that are linked into the hosting application. This situation is undesirable for both the application author and the advertiser. Advertising libraries require additional permissions, resulting in additional permission requests to users. Likewise, a malicious application could simulate the behavior of the advertising library, forging the user's interaction and effectively stealing money from the advertiser. This paper describes AdSplit, where we extended Android to allow an application and its advertising to run as separate processes, under separate user-ids, eliminating the need for applications to request permissions on behalf of their advertising libraries. #R##N#We also leverage mechanisms from Quire to allow the remote server to validate the authenticity of client-side behavior. In this paper, we quantify the degree of permission bloat caused by advertising, with a study of thousands of downloaded apps. AdSplit automatically recompiles apps to extract their ad services, and we measure minimal runtime overhead. We also observe that most ad libraries just embed an HTML widget within and describe how AdSplit can be designed with this in mind to avoid any need for ads to have native code.

Connected through hyperedge HE-1 (induced by source paper "an empirical study of usages updates and risks of third party libraries in java projects"):
  with members:
    - "on the evolution of technical lag in the npm package dependency network"
    - "debloating software through piece wise compilation and loading"
    - "beyond metadata code centric and usage based analysis of known vulnerabilities in open source software"
    - "thou shalt not depend on me analysing the use of outdated javascript libraries on the web"
    - "an empirical study on the impact of refactoring activities on evolving client used apis"
    - "an investigation into the use of common libraries in android apps"
    - "impact assessment for vulnerabilities in open source software libraries"

Connected through hyperedge HE-2 (induced by source paper "enclavedom privilege separation for large tcb applications in trusted execution environments"):
  with members:
    - "pyronia redesigning least privilege and isolation for the age of iot"
    - "erim secure and efficient in process isolation with memory protection keys"
    - "libmpk software abstraction for intel memory protection keys"

Connected through hyperedge HE-3 (induced by source paper "pyronia redesigning least privilege and isolation for the age of iot"):
  with members:
    - "spectre attacks exploiting speculative execution"
    - "longitudinal analysis of android ad library permissions"
    - "quire lightweight provenance for smart phone operating systems"

Connected through hyperedge HE-4 (induced by source paper "security code smells in android icc"):
  with members:
    - "ghera a repository of android app vulnerability benchmarks"
    - "an empirical study on android related vulnerabilities"

Connected through hyperedge HE-5 (induced by source paper "pyronia intra process access control for iot applications"):
  with members:
    - "quire lightweight provenance for smart phone operating systems"

Connected through hyperedge HE-6 (induced by source paper "differentiated context aware hook placement for different owners smartphones"):
  with members:
    - "estimating continuous distributions in bayesian classifiers"

Connected through hyperedge HE-7 (induced by source paper "discovering flaws in security focused static analysis tools for android using systematic mutation"):
  with members:
    - "horndroid practical and sound static analysis of android applications by smt solving"
    - "crashscope a practical tool for automated testing of android applications"
    - "enabling mutation testing for android apps"
    - "automatically discovering reporting and reproducing android application crashes"
    - "quire lightweight provenance for smart phone operating systems"

Connected through hyperedge HE-8 (induced by source paper "android inter app communication threats and detection techniques"):
  with members:
    - "towards automated android app collusion detection"
    - "android security framework enabling generic and extensible access control on android"
    - "cross site scripting attacks on android webview"
    - "a case of collusion a study of the interface between ad libraries and their apps"
    - "dexpler converting android dalvik bytecode to jimple for static analysis with soot"
    - "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.OS(Operating Systems)