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: "improving the efficiency of the ldpc code based mceliece cryptosystem through irregular codes"
  Abstract: We consider the framework of the McEliece cryptosystem based on LDPC codes, which is a promising post-quantum alternative to classical public key cryptosystems. The use of LDPC codes in this context allows to achieve good security levels with very compact keys, which is an important advantage over the classical McEliece cryptosystem based on Goppa codes. However, only regular LDPC codes have been considered up to now, while some further improvement can be achieved by using irregular LDPC codes, which are known to achieve better error correction performance than regular LDPC codes. This is shown in this paper, for the first time at our knowledge. The possible use of irregular transformation matrices is also investigated, which further increases the efficiency of the system, especially in regard to the public key size.

Connected through hyperedge HE-1 (induced by source paper "a joint encryption encoding scheme using qc ldpc codes based on finite geometry"):
  with members:
    - "optimization of the parity check matrix density in qc ldpc code based mceliece cryptosystems"
    - "sosemanuk a fast software oriented stream cipher"

Connected through hyperedge HE-2 (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"
    - "scaling efficient code based cryptosystems for embedded platforms"
    - "on a family of circulant matrices for quasi cyclic low density generator matrix codes"

Connected through hyperedge HE-3 (induced by source paper "enhanced public key security for the mceliece cryptosystem"):
  with members:
    - "security and complexity of the mceliece cryptosystem based on quasi cyclic low density parity check codes"
    - "distinguisher based attacks on public key cryptosystems using reed solomon codes"
    - "optimization of the parity check matrix density in qc ldpc code based mceliece cryptosystems"
    - "an efficient cca2 secure variant of the mceliece cryptosystem in the standard model"
    - "a distinguisher based attack on a variant of mceliece s cryptosystem based on reed solomon codes"
    - "a cca2 secure variant of the mceliece cryptosystem"
    - "error correcting pairs for a public key cryptosystem"
    - "on the decoding complexity of cyclic codes up to the bch bound"

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)