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: "investigating information security risks of mobile device use within organizations"
  Abstract: Mobile devices, such as phones, tablets and laptops, expose businesses and governments to a multitude of information security risks. While Information Systems research has focused on the security and privacy aspects from the end-user perspective regarding mobile devices, very little research has been conducted within corporate environments. In this work, thirty-two mobile devices were returned by employees in a global Fortune 500 company. In the empirical analysis, a number of significant security risks were uncovered which may have led to leakage of valuable intellectual property or exposed the organization to future legal conflicts. The research contribution is an initial empirical report highlighting examples of corporate policy breaches by users along with providing a foundation for future research on the security risks of the pervasive presence of mobile devices in corporate environments.

Connected through hyperedge HE-1 (induced by source paper "android anti forensics modifying cyanogenmod"):
  with members:
    - "using smartphones as a proxy for forensic evidence contained in cloud storage services"

Connected through hyperedge HE-2 (induced by source paper "identifying user behavior from residual data in cloud based synchronized apps"):
  with members:
    - "using smartphones as a proxy for forensic evidence contained in cloud storage services"

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)