human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "ldpc based code hopping for gaussian wiretap channel with limited feedback"):
  Abstract: This paper presents a scheme named code hopping (CodeHop) for gaussian wiretap channels based on nonsystematic low-density parity-check (LDPC) codes. Different from traditional communications, in the CodeHop scheme, the legitimate receiver (Bob) rapidly switches the parity-check matrix upon each correctly received source message block. Given an authenticated public feedback channel, the transmitter's (Alice) parity-check matrix can also be synchronized with the receiver's. As a result, once an eavesdropper (Eve) erroneously decodes a message block, she may not be able to follow the update of subsequent parity-check matrices. Thus, the average BER of Eve will be very close to $0.5$ if the transmitted number of message blocks is large enough. Focused on the measure of security gap defined as the difference of channel quality between Bob and Eve, numerical results show that the CodeHop scheme outperforms other solutions by sufficiently reducing the security gap without sacrificing the error-correcting performance of Bob.

Includes members:
  Member "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "a survey of physical layer security techniques for 5g wireless networks and challenges ahead")
  Member "ldpc code design for the bpsk constrained gaussian wiretap channel":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "an overview of physical layer security with finite alphabet signaling")
  Member "lattice codes for the gaussian wiretap channel":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "secure compute and forward in a bidirectional relay")
  Member "coding for cryptographic security enhancement using stopping sets":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "improving phy security of uav enabled transmission with wireless energy harvesting robust trajectory design and power allocation")
  Member "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "secure relaying in non orthogonal multiple access trusted and untrusted scenarios")
  Member "the secrecy capacity of the mimo wiretap channel":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "angle aware user cooperation for secure massive mimo in rician fading channel")
  Member "applications of ldpc codes to the wiretap channel":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "explicit codes for the wiretap channel a unified design framework")

Question: Please tell me which class the source paper 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)