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 a novel image encryption scheme based on improved hyperchaotic sequences"
  Abstract: Recently, a novel image encryption scheme based on improved hyperchaotic sequences was proposed. A pseudo-random number sequence, generated by a hyper-chaos system, is used to determine two involved encryption functions, bitwise exclusive or (XOR) operation and modulo addition. It was reported that the scheme can be broken with some pairs of chosen plain-images and the corresponding cipher-images. This paper re-evaluates the security of the encryption scheme and finds that the encryption scheme can be broken with only one known plain-image. The performance of the known-plaintext attack, in terms of success probability and computation load, become even much better when two known plain-images are available. In addition, security defects on insensitivity of the encryption result with respect to changes of secret key and plain-image are also reported.

Connected through hyperedge HE-1 (induced by source paper "differential cryptanalysis of image cipher using block based scrambling and image filtering"):
  with members:
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"

Connected through hyperedge HE-2 (induced by source paper "on the cryptanalysis of fridrich s chaotic image encryption scheme"):
  with members:
    - "cracking a hierarchical chaotic image encryption algorithm based on permutation"
    - "deciphering an image cipher based on mixed transformed logistic maps"
    - "breaking a chaotic image encryption algorithm based on modulo addition and xor operation"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"

Connected through hyperedge HE-3 (induced by source paper "cryptanalyzing an image scrambling encryption algorithm of pixel bits"):
  with members:
    - "on the cryptanalysis of fridrich s chaotic image encryption scheme"
    - "cracking a hierarchical chaotic image encryption algorithm based on permutation"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"

Connected through hyperedge HE-4 (induced by source paper "cryptanalysis of a classical chaos based cryptosystem with some quantum cryptography features"):
  with members:
    - "on the cryptanalysis of fridrich s chaotic image encryption scheme"
    - "cracking a hierarchical chaotic image encryption algorithm based on permutation"
    - "deciphering an image cipher based on mixed transformed logistic maps"

Connected through hyperedge HE-5 (induced by source paper "design and arm embedded implementation of a chaotic map based multicast scheme for multiuser speech wireless communication"):
  with members:
    - "on the cryptanalysis of fridrich s chaotic image encryption scheme"
    - "cracking a hierarchical chaotic image encryption algorithm based on permutation"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"
    - "cryptanalyzing an encryption scheme based on blind source separation"

Connected through hyperedge HE-6 (induced by source paper "deciphering an image cipher based on mixed transformed logistic maps"):
  with members:
    - "cryptanalyzing image encryption using chaotic logistic map"
    - "breaking a chaotic image encryption algorithm based on modulo addition and xor operation"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"

Connected through hyperedge HE-7 (induced by source paper "cryptanalyzing a rgb image encryption algorithm based on dna encoding and chaos map"):
  with members:
    - "a rgb image encryption algorithm based on dna encoding and chaos map"
    - "breaking an image encryption algorithm based on chaos"
    - "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)