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: "breaking an image encryption algorithm based on chaos"
  Abstract: Recently, a chaos-based image encryption algorithm called MCKBA (Modified Chaotic-Key Based Algorithm) was proposed. This paper analyzes the security of MCKBA and finds that it can be broken with a differential attack, which requires only four chosen plain-images. Performance of the attack is verified by experimental results. In addition, some defects of MCKBA, including insensitivity with respect to changes of plain-image/secret key, are reported.

Connected through hyperedge HE-1 (induced by source paper "chosen plaintext attack of an image encryption scheme based on modified permutation diffusion structure"):
  with members:
    - "cryptanalyzing an image encryption algorithm based on scrambling and veginere cipher"
    - "a chaotic image encryption scheme owning temp value feedback"
    - "breaking a chaotic image encryption algorithm based on modulo addition and xor operation"
    - "a fast image encryption scheme based on chaotic standard map"

Connected through hyperedge HE-2 (induced by source paper "cryptanalyzing a rgb image encryption algorithm based on dna encoding and chaos map"):
  with members:
    - "breaking a novel image encryption scheme based on improved hyperchaotic sequences"
    - "a rgb image encryption algorithm based on dna encoding and chaos map"
    - "on the security defects of an image encryption scheme"

Connected through hyperedge HE-3 (induced by source paper "breaking a chaotic image encryption algorithm based on modulo addition and xor operation"):
  with members:
    - "breaking a chaotic cryptographic scheme based on composition maps"
    - "on the security defects of an image encryption scheme"
    - "on the security of the yen guo s domino signal encryption algorithm dsea"
    - "chosen plaintext cryptanalysis of a clipped neural network based chaotic cipher"
    - "on the security of the yi tan siew chaotic cipher"

Connected through hyperedge HE-4 (induced by source paper "breaking a chaotic image encryption algorithm based on perceptron model"):
  with members:
    - "chosen plaintext cryptanalysis of a clipped neural network based chaotic cipher"

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)