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: "hash functions using chaotic iterations"
  Abstract: In this paper, a novel formulation of discrete chaotic iterations in the field of dynamical systems is given. Their topological properties are studied: it is mathematically proved that, under some conditions, these iterations have a chaotic behavior in the meaning of Devaney. This chaotic behavior allows us to propose a way to generate new hash functions. An illustration example is detailed in order to show how to use our theoretical study in practice.

Connected through hyperedge HE-1 (induced by source paper "low cost monitoring and intruders detection using wireless video sensor networks"):
  with members:
    - "topological chaos and chaotic iterations application to hash functions"
    - "chaotic iterations versus spread spectrum chaos and stego security"
    - "a pseudo random numbers generator based on chaotic iterations application to watermarking"

Connected through hyperedge HE-2 (induced by source paper "lyapunov exponent evaluation of the cbc mode of operation"):
  with members:
    - "evaluating quality of chaotic pseudo random generators application to information hiding"
    - "topological chaos and chaotic iterations application to hash functions"

Connected through hyperedge HE-3 (induced by source paper "fpga design for pseudorandom number generator based on chaotic iteration used in information hiding application"):
  with members:
    - "an optimization technique on pseudorandom generators based on chaotic iterations"
    - "a new chaos based watermarking algorithm"
    - "steganography a class of secure and robust algorithms"
    - "evaluating quality of chaotic pseudo random generators application to information hiding"
    - "topological chaos and chaotic iterations application to hash functions"
    - "chaotic iterations versus spread spectrum chaos and stego security"

Connected through hyperedge HE-4 (induced by source paper "the dynamics of the cbc mode of operation"):
  with members:
    - "quantitative evaluation of chaotic cbc mode of operation"
    - "evaluating quality of chaotic pseudo random generators application to information hiding"
    - "efficient and cryptographically secure generation of chaotic pseudorandom numbers on gpu"

Connected through hyperedge HE-5 (induced by source paper "proving chaotic behavior of cbc mode of operation"):
  with members:
    - "evaluating quality of chaotic pseudo random generators application to information hiding"
    - "efficient and cryptographically secure generation of chaotic pseudorandom numbers on gpu"

Connected through hyperedge HE-6 (induced by source paper "quantitative evaluation of chaotic cbc mode of operation"):
  with members:
    - "evaluating quality of chaotic pseudo random generators application to information hiding"
    - "efficient and cryptographically secure generation of chaotic pseudorandom numbers on gpu"

Connected through hyperedge HE-7 (induced by source paper "neural networks and chaos construction evaluation of chaotic networks and prediction of chaos with multilayer feedforward networks"):
  with members:
    - "a new chaos based watermarking algorithm"
    - "chaotic iterations versus spread spectrum chaos and stego security"

Connected through hyperedge HE-8 (induced by source paper "two security layers for hierarchical data aggregation in sensor networks"):
  with members:
    - "chaotic iterations versus spread spectrum chaos and stego security"

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)