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: "physical layer security combining error control coding and cryptography"
  Abstract: In this paper we consider tandem error control coding and cryptography in the setting of the wiretap channel due to Wyner. In a typical communications system a cryptographic application is run at a layer above the physical layer and assumes the channel is error free. However, in any real application the channels for friendly users and passive eavesdroppers are not error free and Wyner's wiretap model addresses this scenario. Using this model, we show the security of a common cryptographic primitive, i.e. a keystream generator based on linear feedback shift registers (LFSR), can be strengthened by exploiting properties of the physical layer. A passive eavesdropper can be made to experience greater difficulty in cracking an LFSR-based cryptographic system insomuch that the computational complexity of discovering the secret key increases by orders of magnitude, or is altogether infeasible. This result is shown for two fast correlation attacks originally presented by Meier and Staffelbach, in the context of channel errors due to the wiretap channel model.

Connected through hyperedge HE-1 (induced by source paper "low complexity secure code lcsc design for big data in cloud storage systems"):
  with members:
    - "secure and private cloud storage systems with random linear fountain codes"
    - "cloud based deep learning of big eeg data for epileptic seizure prediction"
    - "a secure approach for caching contents in wireless ad hoc networks"
    - "multihop caching aided coded multicasting for the next generation of cellular networks"
    - "secure repairable fountain codes"
    - "throughput analysis of decentralized coded content caching in cellular networks"
    - "capacity of cellular networks with femtocache"
    - "optimal locally repairable and secure codes for distributed storage systems"

Connected through hyperedge HE-2 (induced by source paper "physical layer security does it work in a real environment"):
  with members:
    - "quantifying equivocation for finite blocklength wiretap codes"
    - "analysis of short blocklength codes for secrecy"
    - "semantically secure lattice codes for the gaussian wiretap channel"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "coding for cryptographic security enhancement using stopping sets"

Connected through hyperedge HE-3 (induced by source paper "multi tenant c ran with spectrum pooling downlink optimization under privacy constraints"):
  with members:
    - "optimization of massive full dimensional mimo for positioning and communication"
    - "inter operator base station coordination in spectrum shared millimeter wave cellular networks"
    - "cross layer design for downlink multihop cloud radio access networks with network coding"
    - "joint base station clustering and beamforming for non orthogonal multicast and unicast transmission with backhaul constraints"
    - "on the optimal fronthaul compression and decoding strategies for uplink cloud radio access networks"
    - "multivariate fronthaul quantization for downlink c ran"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "robust group sparse beamforming for multicast green cloud ran with imperfect csi"

Connected through hyperedge HE-4 (induced by source paper "secrecy analysis on network coding in bidirectional multibeam satellite communications"):
  with members:
    - "secure communication over parallel relay channel"
    - "a secure communication game with a relay helping the eavesdropper"
    - "interference alignment for secrecy"
    - "joint relay and jammer selection for secure two way relay networks"
    - "secure satellite communication systems design with individual secrecy rate constraints"

Connected through hyperedge HE-5 (induced by source paper "coding for cryptographic security enhancement using stopping sets"):
  with members:
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "non systematic codes for physical layer security"
    - "strong secrecy for erasure wiretap channels"
    - "secrecy achieving polar coding for binary input memoryless symmetric wire tap channels"
    - "the wiretap channel with feedback encryption over the channel"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-6 (induced by source paper "non systematic codes for physical layer security"):
  with members:
    - "the wiretap channel with feedback encryption over the channel"
    - "shannon s secrecy system with informed receivers and its application to systematic coding for wiretapped channels"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-7 (induced by source paper "tandem coding and cryptography on wiretap channels exit chart analysis"):
  with members:
    - "applications of ldpc codes to the wiretap channel"

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.IT(Information Theory)