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: "testing d sequences for their randomness"
  Abstract: This paper examines the randomness of d-sequences, which are decimal sequences to an arbitrary base. Our motivation is to check their suitability for application to cryptography, spread-spectrum systems and use as pseudorandom sequence.

Connected through hyperedge HE-1 (induced by source paper "new class of pseudorandom d sequences to generate cryptographic keys"):
  with members:
    - "a survey of p2p network security"
    - "randomness of d sequences via diehard testing"
    - "binary random sequences obtained from decimal sequences"

Connected through hyperedge HE-2 (induced by source paper "efficient key generation for dynamic blom s scheme"):
  with members:
    - "key management in wireless sensor networks using a modified blom scheme"
    - "watermarking using decimal sequences"

Connected through hyperedge HE-3 (induced by source paper "binary random sequences obtained from decimal sequences"):
  with members:
    - "testing kak s conjecture on binary reciprocal of primes and cryptographic applications"
    - "period of the d sequence based random number generator"
    - "the cubic public key transformation"
    - "a d sequence based recursive random number generator"
    - "watermarking using decimal sequences"

Connected through hyperedge HE-4 (induced by source paper "analysis of prime reciprocal sequences in base 10"):
  with members:
    - "testing kak s conjecture on binary reciprocal of primes and cryptographic applications"
    - "period of the d sequence based random number generator"
    - "a d sequence based recursive random number generator"
    - "watermarking using decimal sequences"

Connected through hyperedge HE-5 (induced by source paper "partial cross correlation of d sequences based cdma system"):
  with members:
    - "period of the d sequence based random number generator"
    - "a d sequence based recursive random number generator"
    - "watermarking using decimal sequences"

Connected through hyperedge HE-6 (induced by source paper "period of the d sequence based random number generator"):
  with members:
    - "the cubic public key transformation"
    - "a d sequence based recursive random number generator"
    - "watermarking using decimal sequences"

Connected through hyperedge HE-7 (induced by source paper "testing kak s conjecture on binary reciprocal of primes and cryptographic applications"):
  with members:
    - "watermarking using decimal sequences"

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)