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: "an efficient attack of a mceliece cryptosystem variant based on convolutional codes"
  Abstract: L\"ondahl and Johansson proposed last year a variant of the McEliece cryptosystem which replaces Goppa codes by convolutional codes. This modification is supposed to make structural attacks more difficult since the public generator matrix of this scheme contains large parts which are generated completely at random. They proposed two schemes of this kind, one of them consists in taking a Goppa code and extending it by adding a generator matrix of a time varying convolutional code. We show here that this scheme can be successfully attacked by looking for low-weight codewords in the public code of this scheme and using it to unravel the convolutional part. It remains to break the Goppa part of this scheme which can be done in less than a day of computation in the case at hand.

Connected through hyperedge HE-1 (induced by source paper "encryption scheme based on expanded reed solomon codes"):
  with members:
    - "generalization of the ball collision algorithm"
    - "ledakem a post quantum key encapsulation mechanism based on qc ldpc codes"
    - "variations of the mceliece cryptosystem"
    - "cryptanalysis of mceliece cryptosystem based on algebraic geometry codes and their subcodes"
    - "polynomial time attack on wild mceliece over quadratic extensions"
    - "distinguisher based attacks on public key cryptosystems using reed solomon codes"
    - "a distinguisher based attack on a variant of mceliece s cryptosystem based on reed solomon codes"
    - "cryptanalysis of two mceliece cryptosystems based on quasi cyclic codes"

Connected through hyperedge HE-2 (induced by source paper "cryptanalysis of a public key encryption scheme based on qc ldpc and qc mdpc codes"):
  with members:
    - "worst case qc mdpc decoder for mceliece cryptosystem"
    - "quantum resistant random linear code based public key encryption scheme rlce"
    - "a polynomial time attack against algebraic geometry code based public key cryptosystems"
    - "distinguisher based attacks on public key cryptosystems using reed solomon codes"

Connected through hyperedge HE-3 (induced by source paper "polynomial time attack on wild mceliece over quadratic extensions"):
  with members:
    - "linear independence of rank 1 matrices and the dimension of products of codes"
    - "squares of random linear codes"
    - "a polynomial time attack on the bbcrs scheme"
    - "cryptanalysis of mceliece cryptosystem based on algebraic geometry codes and their subcodes"
    - "cryptanalysis of public key cryptosystems that use subcodes of algebraic geometry codes"
    - "folding alternant and goppa codes with non trivial automorphism groups"
    - "a polynomial time attack against algebraic geometry code based public key cryptosystems"
    - "distinguisher based attacks on public key cryptosystems using reed solomon codes"

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)