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: "efficient reconciliation protocol for discrete variable quantum key distribution"
  Abstract: Reconciliation is an essential part of any secret-key agreement protocol and hence of a Quantum Key Distribution (QKD) protocol, where two legitimate parties are given correlated data and want to agree on a common string in the presence of an adversary, while revealing a minimum amount of information. In this paper, we show that for discrete-variable QKD protocols, this problem can be advantageously solved with Low Density Parity Check (LDPC) codes optimized for the binary symmetric channel (BSC). In particular, we demonstrate that our method leads to a significant improvement of the achievable secret key rate, with respect to earlier interactive reconciliation methods used in QKD.

Connected through hyperedge HE-1 (induced by source paper "improved reconciliation with polar codes in quantum key distribution"):
  with members:
    - "fast list decoders for polar codes"
    - "list decoding of polar codes"
    - "hardware implementation of successive cancellation decoders for polar codes"
    - "channel polarization a method for constructing capacity achieving codes for symmetric binary input memoryless channels"

Connected through hyperedge HE-2 (induced by source paper "low power secret key agreement over ofdm"):
  with members:
    - "coding with scrambling concatenation and harq for the awgn wire tap channel a security gap analysis"
    - "exploiting channel diversity in secret key generation from multipath fading randomness"
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "increasing physical layer security through scrambled codes and arq"
    - "on a family of circulant matrices for quasi cyclic low density generator matrix codes"
    - "non systematic codes for physical layer security"
    - "secure communication in the low snr regime"

Connected through hyperedge HE-3 (induced by source paper "separation of reliability and secrecy in rate limited secret key generation"):
  with members:
    - "polar coding for secret key generation"
    - "efficient one way secret key agreement and private channel coding via polarization"
    - "non asymptotic analysis of privacy amplification via renyi entropy and inf spectral entropy"
    - "rate compatible protocol for information reconciliation an application to qkd"
    - "the secret key private key capacity region for three terminals"
    - "reconciliation of a quantum distributed gaussian key"

Connected through hyperedge HE-4 (induced by source paper "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"):
  with members:
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "polar coding for secure transmission and key agreement"
    - "non systematic codes for physical layer security"
    - "channel polarization a method for constructing capacity achieving codes for symmetric binary input memoryless channels"
    - "secret sharing over fast fading mimo wiretap channels"
    - "secure nested codes for type ii wiretap channels"
    - "side information coding with turbo codes and its application to quantum key distribution"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-5 (induced by source paper "interactive reconciliation with low density parity check codes"):
  with members:
    - "rate compatible protocol for information reconciliation an application to qkd"

Connected through hyperedge HE-6 (induced by source paper "rate compatible protocol for information reconciliation an application to qkd"):
  with members:
    - "problems in application of ldpc codes to information reconciliation in quantum key distribution protocols"

Connected through hyperedge HE-7 (induced by source paper "secure rate adaptive reconciliation"):
  with members:
    - "rate compatible protocol for information reconciliation an application to qkd"

Connected through hyperedge HE-8 (induced by source paper "problems in application of ldpc codes to information reconciliation in quantum key distribution protocols"):
  with members:
    - "side information coding with turbo codes and its application to quantum key distribution"

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.IT(Information Theory)