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: "the decentralized financial crisis attacking defi"
  Abstract: The Global Financial Crisis of 2008, caused by excessive financial risk, inspired Nakamoto to create Bitcoin. Now, more than ten years later, Decentralized Finance (DeFi), a peer-to-peer financial paradigm which leverages blockchain-based smart contracts to ensure its integrity and security, contains over 1bn USD of capital as of February 2020. Yet as this ecosystem develops, with protocols intertwining and the complexity of financial products increasing, it is at risk of the very sort of financial meltdown it is supposed to be preventing. #R##N#In this paper we explore how design weaknesses in DeFi protocols could lead to a DeFi crisis. First, overcollateralized DeFi protocols are vulnerable to exogenous price shocks. We quantify the robustness of DeFi lending protocols in the presence of significant falls in the value of the assets these protocols are based on, showing for a range of parameters the speed at which a DeFi protocol would become undercollateralized. Second, we present a governance attack on Maker - the largest DeFi protocol by market share - that allows an attacker to steal all 0.5bn USD worth of collateral. Moreover, we present a novel strategy that would allow an attacker to steal the Maker collateral within just two transactions and without the need to lock any tokens. This paper shows that with the composition of collateralized debt in these DeFi protocols, the failure of one protocol may lead to financial contagion, resulting in losses ranging from 145m USD to in excess of 246m USD.

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)