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: "cryptanalysis of an image encryption scheme based on a compound chaotic sequence"
  Abstract: Recently, an image encryption scheme based on a compound chaotic sequence was proposed. In this paper, the security of the scheme is studied and the following problems are found: (1) a differential chosen-plaintext attack can break the scheme with only three chosen plain-images; (2) there is a number of weak keys and some equivalent keys for encryption; (3) the scheme is not sensitive to the changes of plain-images; and (4) the compound chaotic sequence does not work as a good random number source.

Connected through hyperedge HE-1 (induced by source paper "cryptanalysis of a chaos based fast image encryption algorithm for embedded systems"):
  with members:
    - "cryptanalyzing image encryption using chaotic logistic map"

Connected through hyperedge HE-2 (induced by source paper "cryptanalyzing image encryption using chaotic logistic map"):
  with members:
    - "breaking a chaotic image encryption algorithm based on perceptron model"
    - "on the security defects of an image encryption scheme"
    - "breaking a modified substitution diffusion image cipher based on chaotic standard and logistic maps"

Connected through hyperedge HE-3 (induced by source paper "breaking a novel colour image encryption algorithm based on chaos"):
  with members:
    - "on the security defects of an image encryption scheme"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"

Connected through hyperedge HE-4 (induced by source paper "breaking an image encryption algorithm based on chaos"):
  with members:
    - "on the security defects of an image encryption scheme"
    - "breaking a modified substitution diffusion image cipher based on chaotic standard and logistic maps"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"

Connected through hyperedge HE-5 (induced by source paper "breaking a modified substitution diffusion image cipher based on chaotic standard and logistic maps"):
  with members:
    - "on the security defects of an image encryption scheme"

Connected through hyperedge HE-6 (induced by source paper "breaking a new substitution diffusion based image cipher using chaotic standard and logistic maps"):
  with members:
    - "on the security defects of an image encryption scheme"

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)