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: "proxy blocking latency"
  Abstract: Censors of the Internet must continually discover and block new circumvention proxy servers. We seek to understand the pace of this process, specifically, the length of the delay between when a proxy becomes potentially discoverable and when the censor blocks it. We measure this delay by testing the reachability of previously unseen Tor bridges, before and after their introduction into Tor Browser, from sites in the U.S., China, and Iran, over a period of five months. We find that China's national firewall blocks these new bridges, but only after a varying delay of between 2 and 18 days, and that blocking occurs only after a user-ready software release, despite bridges being available earlier in source code. While the firewall notices new bridges in Tor Browser, bridges that appear only in Orbot, a version of Tor for mobile devices, remain unblocked. This work highlights the fact that censors can behave in unintuitive ways, which presents difficulties for threat modeling but also opportunities for evasion.

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)