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: "on the security of the yi tan siew chaotic cipher"
  Abstract: This paper presents a comprehensive analysis on the security of the Yi-Tan-Siew chaotic cipher. A differential chosen-plaintext attack and a differential chosen-ciphertext attack are suggested to break the sub-key K, under the assumption that the time stamp can be altered by the attacker, which is reasonable in such attacks. Also, some security problems about the sub-keys /spl alpha/ and /spl beta/ are clarified, from both theoretical and experimental points of view. Further analysis shows that the security of this cipher is independent of the use of the chaotic tent map, once the sub-key K is removed via the proposed suggested differential chosen-plaintext attack.

Connected through hyperedge HE-1 (induced by source paper "breaking a chaotic image encryption algorithm based on modulo addition and xor operation"):
  with members:
    - "breaking an image encryption algorithm based on chaos"
    - "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"

Connected through hyperedge HE-2 (induced by source paper "breaking a novel image encryption scheme based on improved hyperchaotic sequences"):
  with members:
    - "breaking a chaotic image encryption algorithm based on modulo addition and xor operation"
    - "breaking a chaotic image encryption algorithm based on perceptron model"
    - "on the security defects of an image encryption scheme"

Connected through hyperedge HE-3 (induced by source paper "breaking a chaotic cryptographic scheme based on composition maps"):
  with members:
    - "on the security defects of an image encryption scheme"
    - "a general quantitative cryptanalysis of permutation only multimedia ciphers against plaintext attacks"
    - "security analysis of a chaos based image encryption algorithm"
    - "on the security of the yen guo s domino signal encryption algorithm dsea"

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)