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: "extension of overbeck s attack for gabidulin based cryptosystems"
  Abstract: We present a new attack against cryptosystems based on the rank metric. Our attack allows us to cryptanalyze two variants of the GPT cryptosystem which were designed to resist the attack of Overbeck.

Connected through hyperedge HE-1 (induced by source paper "equivalence and characterizations of linear rank metric codes based on invariants"):
  with members:
    - "on the security of a loidreau s rank metric code based encryption scheme"
    - "invariants and inequivalence of linear rank metric codes"
    - "random construction of partial mds codes"
    - "systematic encoders for generalized gabidulin codes and the q analogue of cauchy matrices"
    - "on the genericity of maximum rank distance and gabidulin codes"
    - "generalized gabidulin codes over fields of any characteristic"
    - "new criteria for mrd and gabidulin codes and some rank metric code constructions"
    - "further generalisations of twisted gabidulin codes"

Connected through hyperedge HE-2 (induced by source paper "new criteria for mrd and gabidulin codes and some rank metric code constructions"):
  with members:
    - "algebraic structures of mrd codes"
    - "equivalence for rank metric and matrix codes and automorphism groups of gabidulin codes"

Connected through hyperedge HE-3 (induced by source paper "improved cryptanalysis of rank metric schemes based on gabidulin codes"):
  with members:
    - "on the complexity of the rank syndrome decoding problem"
    - "a smart approach for gpt cryptosystem based on rank codes"
    - "on improving security of gpt cryptosystems"

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.CR(Cryptography and Security)