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: "length based attacks for certain group based encryption rewriting systems"
  Abstract: In this note, we describe a probabilistic attack on public key cryptosystems based on the word/conjugacy problems for finitely presented groups of the type proposed recently by Anshel, Anshel and Goldfeld. In such a scheme, one makes use of the property that in the given group the word problem has a polynomial time solution, while the conjugacy problem has no known polynomial solution. An example is the braid group from topology in which the word problem is solvable in polynomial time while the only known solutions to the conjugacy problem are exponential. The attack in this paper is based on having a canonical representative of each string relative to which a length function may be computed. Hence the term length attack. Such canonical representatives are known to exist for the braid group.

Connected through hyperedge HE-1 (induced by source paper "the status of polycyclic group based cryptography a survey and open problems"):
  with members:
    - "polynomial time solutions of computational problems in noncommutative algebraic cryptography"
    - "a secret sharing scheme based on group presentations and the word problem"
    - "non commutative digital signatures"
    - "zero knowledge authentication schemes from actions on graphs groups or rings"

Connected through hyperedge HE-2 (induced by source paper "polynomial time solutions of computational problems in noncommutative algebraic cryptography"):
  with members:
    - "non associative public key cryptography"
    - "braid group cryptography"

Connected through hyperedge HE-3 (induced by source paper "heisenberg groups as platform for the aag key exchange protocol"):
  with members:
    - "non commutative digital signatures"
    - "length based cryptanalysis the case of thompson s group"

Connected through hyperedge HE-4 (induced by source paper "braid group cryptography"):
  with members:
    - "using shifted conjugacy in braid based cryptography"

Connected through hyperedge HE-5 (induced by source paper "cryptanalysis of group based key agreement protocols using subgroup distance functions"):
  with members:
    - "length based cryptanalysis the case of thompson s group"

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)