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: "operator and manufacturer independent d2d private link for future 5g networks"
  Abstract: Direct Mobile-to-Mobile communication mode known also as Device-to-Device (D2D) communication is expected to be supported in the 5G mobile system. D2D communication aims to improve system spectrum efficiency, overall system throughput, energy efficiency and reduce the connection delay between devices. However, new security threats and challenges need to be considered regarding device and user authentication to avoid unauthorized access, abuse and attacks on the whole system. In this paper, a strong standalone authentication technique therefore is proposed. It is based on combining users biometric identities and a new clone-resistant device identity. The novel property of the proposal is that it is fully independent on both device manufacturer and mobile system operator. The biometric identity deploys user keystroke dynamics and accelerometer to generate user biometric identity by deploying a machine learning technique. The proposed mobile device clone-resistant identity is based on deploying a new concept of a pure digital clone-resistant structure which is both manufacturer and mobile operator-independent. When combining both identities, a mutually authenticated D2D secured link between any two devices can be established in addition to a strong user-device authentication. Furthermore, the concept does not allow the managing trusted authority to intercept users private links. Being an independent and standalone system, the technique would offer a broad spectrum of attractive future smart applications over the 5G mobile system infrastructure.

Connected through hyperedge HE-1 (induced by source paper "digitally mutating nv fpgas into physically clone resistant units"):
  with members:
    - "new family of stream ciphers as physically clone resistant vlsi structures"
    - "the impact of quantum computing on present cryptography"

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)