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: "the basic discrete hilbert transform with an information hiding application"
  Abstract: This paper presents several experimental findings related to the basic discrete Hilbert transform. The errors in the use of a finite set of the transform values have been tabulated for the more commonly used functions. The error can be quite small and, for example, it is of the order of 10^{-17} for the chirp signal. The use of the discrete Hilbert transform in hiding information is presented.

Connected through hyperedge HE-1 (induced by source paper "a key set cipher for wireless sensor networks"):
  with members:
    - "random residue sequences and the number theoretic hilbert transform"
    - "new results on the number theoretic hilbert transform"
    - "a class of orthogonal sequences"
    - "the 10 point and 12 point number theoretic hilbert transform"
    - "the number theoretic hilbert transform"

Connected through hyperedge HE-2 (induced by source paper "random residue sequences and the number theoretic hilbert transform"):
  with members:
    - "new results on the number theoretic hilbert transform"
    - "the 10 point and 12 point number theoretic hilbert transform"
    - "the number theoretic hilbert transform"
    - "watermarking using decimal sequences"

Connected through hyperedge HE-3 (induced by source paper "new results on the number theoretic hilbert transform"):
  with members:
    - "the 10 point and 12 point number theoretic hilbert transform"
    - "the number theoretic hilbert transform"
    - "towards a number theoretic discrete hilbert transform"

Connected through hyperedge HE-4 (induced by source paper "a class of orthogonal sequences"):
  with members:
    - "new results on the number theoretic hilbert transform"
    - "the number theoretic hilbert transform"

Connected through hyperedge HE-5 (induced by source paper "the 10 point and 12 point number theoretic hilbert transform"):
  with members:
    - "the number theoretic hilbert transform"
    - "towards a number theoretic discrete hilbert transform"

Connected through hyperedge HE-6 (induced by source paper "the number theoretic hilbert transform"):
  with members:
    - "encryption of binary and non binary data using chained hadamard transforms"
    - "towards a number theoretic discrete hilbert transform"

Connected through hyperedge HE-7 (induced by source paper "randomization using quasigroups hadamard and number theoretic transforms"):
  with members:
    - "using quasigroups for generating pseudorandom numbers"
    - "encryption of binary and non binary data using chained hadamard transforms"

Connected through hyperedge HE-8 (induced by source paper "towards a number theoretic discrete hilbert transform"):
  with members:
    - "a dht based measure of randomness"

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)