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: "signature generation for sensitive information leakage in android applications"
  Abstract: In recent years, there has been rapid growth in mobile devices such as smartphones, and a number of applications are developed specifically for the smartphone market. In particular, there are many applications that are ``free'' to the user, but depend on advertisement services for their revenue. Such applications include an advertisement module - a library provided by the advertisement service - that can collect a user's sensitive information and transmit it across the network. Users accept this business model, but in most cases the applications do not require the user's acknowledgment in order to transmit sensitive information. Therefore, such applications' behavior becomes an invasion of privacy. In our analysis of 1,188 Android applications' network traffic and permissions, 93% of the applications we analyzed connected to multiple destinations when using the network. 61% required a permission combination that included both access to sensitive information and use of networking services. These applications have the potential to leak the user's sensitive information. In an effort to enable users to control the transmission of their private information, we propose a system which, using a novel clustering method based on the HTTP packet destination and content distances, generates signatures from the clustering result and uses them to detect sensitive information leakage from Android applications. Our system does not require an Android framework modification or any special privileges. Thus users can easily introduce our system to their devices, and manage suspicious applications' network behavior in a fine grained manner. Our system accurately detected 94% of the sensitive information leakage from the applications evaluated and produced only 5% false negative results, and less than 3% false positive results.

Connected through hyperedge HE-1 (induced by source paper "the dark side channel of mobile devices a survey on network traffic analysis"):
  with members:
    - "robust smartphone app identification via encrypted network traffic analysis"
    - "demo recon revealing and controlling pii leaks in mobile network traffic"
    - "no nat d user left behind fingerprinting users behind nat from netflow records alone"

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)