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: "on a family of circulant matrices for quasi cyclic low density generator matrix codes"
  Abstract: We present a new class of sparse and easily invertible circulant matrices that can have a sparse inverse though not being permutation matrices. Their study is useful in the design of quasi-cyclic low-density generator matrix codes that are able to join the inner structure of quasi-cyclic codes with sparse generator matrices, so limiting the number of elementary operations needed for encoding. Circulant matrices of the proposed class permit to hit both targets without resorting to identity or permutation matrices that may penalize the code minimum distance and often cause significant error floors.

Connected through hyperedge HE-1 (induced by source paper "soft mceliece mdpc code based mceliece cryptosystems with very compact keys through real valued intentional errors"):
  with members:
    - "security and complexity of the mceliece cryptosystem based on quasi cyclic low density parity check codes"
    - "optimization of the parity check matrix density in qc ldpc code based mceliece cryptosystems"
    - "improving the efficiency of the ldpc code based mceliece cryptosystem through irregular codes"
    - "scaling efficient code based cryptosystems for embedded platforms"

Connected through hyperedge HE-2 (induced by source paper "array convolutional low density parity check codes"):
  with members:
    - "progressive differences convolutional low density parity check codes"
    - "deriving good ldpc convolutional codes from ldpc block codes"
    - "error rate analysis for coded multicarrier systems over quasi static fading channels"
    - "shortened array codes of large girth"

Connected through hyperedge HE-3 (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"
    - "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-4 (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"
    - "non systematic codes for physical layer security"
    - "construction of near optimum burst erasure correcting low density parity check codes"

Connected through hyperedge HE-5 (induced by source paper "improving the efficiency of the ldpc code based mceliece cryptosystem through irregular codes"):
  with members:
    - "security and complexity of the mceliece cryptosystem based on quasi cyclic low density parity check codes"
    - "optimization of the parity check matrix density in qc ldpc code based mceliece cryptosystems"
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "interleaved product ldpc codes"
    - "progressive differences convolutional low density parity check codes"
    - "scaling efficient code based cryptosystems for embedded platforms"
    - "construction of near optimum burst erasure correcting low density parity check codes"

Connected through hyperedge HE-6 (induced by source paper "security and complexity of the mceliece cryptosystem based on quasi cyclic low density parity check codes"):
  with members:
    - "key reduction of mceliece s cryptosystem using list decoding"
    - "cryptanalysis of two mceliece cryptosystems based on quasi cyclic codes"
    - "ldpc codes in the mceliece cryptosystem attacks and countermeasures"

Connected through hyperedge HE-7 (induced by source paper "advanced channel coding for space mission telecommand links"):
  with members:
    - "interleaved product ldpc codes"
    - "progressive differences convolutional low density parity check codes"
    - "an improved sphere packing bound for finite length codes on symmetric memoryless channels"

Connected through hyperedge HE-8 (induced by source paper "using ldgm codes and sparse syndromes to achieve digital signatures"):
  with members:
    - "security and complexity of the mceliece cryptosystem based on quasi cyclic low density parity check codes"
    - "optimization of the parity check matrix density in qc ldpc code based mceliece cryptosystems"
    - "enhanced public key security for the mceliece cryptosystem"

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)