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: "non systematic codes for physical layer security"
  Abstract: This paper is a first study on the topic of achieving physical layer security by exploiting non-systematic channel codes. The chance of implementing transmission security at the physical layer is known since many years in information theory, but it is now gaining an increasing interest due to its many possible applications. It has been shown that channel coding techniques can be effectively exploited for designing physical layer security schemes, able to ensure that an unauthorized receiver, experiencing a channel different from that of the the authorized receiver, is not able to gather any information. Recently, it has been proposed to exploit puncturing techniques in order to reduce the security gap between the authorized and unauthorized channels. In this paper, we show that the same target can also be achieved by using non-systematic codes, able to scramble information bits within the transmitted codeword.

Connected through hyperedge HE-1 (induced by source paper "an overview of physical layer security with finite alphabet signaling"):
  with members:
    - "a survey of physical layer security techniques for 5g wireless networks and challenges ahead"
    - "physical layer cryptography through massive mimo"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "sum secrecy rate maximization for full duplex two way relay networks using alamouti based rank two beamforming"
    - "performance of lattice coset codes on universal software radio peripherals"
    - "secure m psk communication via directional modulation"
    - "finite blocklength bounds for wiretap channels"
    - "physical layer security in millimeter wave cellular networks"

Connected through hyperedge HE-2 (induced by source paper "analysis of short blocklength codes for secrecy"):
  with members:
    - "quantifying equivocation for finite blocklength wiretap codes"
    - "performance assessment and design of finite length ldpc codes for the gaussian wiretap channel"
    - "semantically secure lattice codes for the gaussian wiretap channel"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "deterministic constructions for large girth protograph ldpc codes"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "ldpc code design for the bpsk constrained gaussian wiretap channel"
    - "achieving the secrecy capacity of wiretap channels using polar codes"

Connected through hyperedge HE-3 (induced by source paper "practical ldpc coded modulation schemes for the fading broadcast channel with confidential messages"):
  with members:
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "a physical layer secured key distribution technique for ieee 802 11g wireless networks"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "broadcast channels with confidential messages by randomness constrained stochastic encoder"
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "increasing physical layer security through scrambled codes and arq"
    - "secure broadcasting over fading channels with statistical qos constraints"
    - "capacity region of gaussian mimo broadcast channels with common and confidential messages"

Connected through hyperedge HE-4 (induced by source paper "ldpc coded transmissions over the gaussian broadcast channel with confidential messages"):
  with members:
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "broadcast channels with confidential messages by randomness constrained stochastic encoder"
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "increasing physical layer security through scrambled codes and arq"
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "capacity region of gaussian mimo broadcast channels with common and confidential messages"
    - "secrecy gain a wiretap lattice code design"

Connected through hyperedge HE-5 (induced by source paper "secrecy transmission on block fading channels theoretical limits and performance of practical codes"):
  with members:
    - "on secrecy capacity of fast fading multiple input wiretap channels with statistical csit"
    - "a physical layer secured key distribution technique for ieee 802 11g wireless networks"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "on secrecy rate of the generalized artificial noise assisted secure beamforming for wiretap channels"
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "increasing physical layer security through scrambled codes and arq"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "achieving the secrecy capacity of wiretap channels using polar codes"

Connected through hyperedge HE-6 (induced by source paper "low power secret key agreement over ofdm"):
  with members:
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "exploiting channel diversity in secret key generation from multipath fading randomness"
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "increasing physical layer security through scrambled codes and arq"
    - "on a family of circulant matrices for quasi cyclic low density generator matrix codes"
    - "efficient reconciliation protocol for discrete variable quantum key distribution"
    - "secure communication in the low snr regime"

Connected through hyperedge HE-7 (induced by source paper "optimization of the parity check matrix density in qc ldpc code based mceliece cryptosystems"):
  with members:
    - "security and complexity of the mceliece cryptosystem based on quasi cyclic low density parity check codes"
    - "low power secret key agreement over ofdm"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "increasing physical layer security through scrambled codes and arq"
    - "enhanced public key security for the mceliece cryptosystem"
    - "on a family of circulant matrices for quasi cyclic low density generator matrix codes"
    - "construction of near optimum burst erasure correcting low density parity check codes"

Connected through hyperedge HE-8 (induced by source paper "a physical layer secured key distribution technique for ieee 802 11g wireless networks"):
  with members:
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "increasing physical layer security through scrambled codes and arq"
    - "keys through arq theory and practice"

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)