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: "prifi low latency metadata protection for organizational network"
  Abstract: Organizational networks are vulnerable to traffic-analysis attacks that enable adversaries to infer sensitive information from network traffic -- even if encryption is used. We present PriFi, an anonymous communication protocol for LANs which provides identity protection and provable tracking-resistance against eavesdropper; it has low latency and is application agnostic. PriFi builds on Dining Cryptographers networks (DC-nets) and solves several of their limitations. For instance, the communication latency is reduced via a client/relay/server architecture tailored to LANs, where a set of servers assist the anonymization process without adding latency. Unlike mix networks and other DC-nets systems, a client's packets remain on their usual network path without additional hops. Moreover, PriFi protects clients against equivocation attacks without adding significant latency overhead and without requiring communication among clients. PriFi also detects disruption (jamming) attacks without costly consensus among servers. We evaluate the practicality of PriFi in the context of a large, real-world organization at risk of traffic-analysis attacks. Our results show that PriFi introduces a small latency overhead ($\approx120$ms for $100$ clients) and is compatible with delay-sensitive applications such as VoIP.

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)