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: "increasing physical layer security through scrambled codes and arq"
  Abstract: We elaborate on the proposal of non-systematic channel codes on the AWGN wire-tap channel. Such coding technique, based on scrambling, achieves secure transmission with a small security gap between the authorized receiver (Bob) and the unauthorized one (Eve). In this paper, we show that, by implementing scrambling and descrambling on blocks of concatenated frames, rather than on single frames, the security gap between Bob and Eve can be further reduced. The usage of concatenated scrambling also allows to achieve security when Bob and Eve experience the same channel quality. In this case, the introduction of an ARQ protocol with authentication is needed.

Connected through hyperedge HE-1 (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"
    - "secure broadcasting over fading channels with statistical qos constraints"
    - "capacity region of gaussian mimo broadcast channels with common and confidential messages"
    - "non systematic codes for physical layer security"

Connected through hyperedge HE-2 (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"
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "capacity region of gaussian mimo broadcast channels with common and confidential messages"
    - "non systematic codes for physical layer security"
    - "secrecy gain a wiretap lattice code design"

Connected through hyperedge HE-3 (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"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "coding for cryptographic security enhancement using stopping sets"

Connected through hyperedge HE-4 (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"
    - "on a family of circulant matrices for quasi cyclic low density generator matrix codes"
    - "non systematic codes for physical layer security"
    - "efficient reconciliation protocol for discrete variable quantum key distribution"
    - "secure communication in the low snr regime"

Connected through hyperedge HE-5 (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"
    - "enhanced public key security for the mceliece cryptosystem"
    - "on a family of circulant matrices for quasi cyclic low density generator matrix codes"
    - "non systematic codes for physical layer security"
    - "construction of near optimum burst erasure correcting low density parity check codes"

Connected through hyperedge HE-6 (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"
    - "keys through arq theory and practice"
    - "non systematic codes for physical layer security"

Connected through hyperedge HE-7 (induced by source paper "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"):
  with members:
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "ldpc code design for the bpsk constrained gaussian wiretap channel"
    - "non systematic codes for physical layer security"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"
    - "arq secrecy from theory to practice"
    - "the wiretap channel with feedback encryption over the 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)