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: "cooperative secret key generation from phase estimation in narrowband fading channels"
  Abstract: By exploiting multipath fading channels as a source of common randomness, physical layer (PHY) based key generation protocols allow two terminals with correlated observations to generate secret keys with information-theoretical security. The state of the art, however, still suffers from major limitations, e.g., low key generation rate, lower entropy of key bits and a high reliance on node mobility. In this paper, a novel cooperative key generation protocol is developed to facilitate high-rate key generation in narrowband fading channels, where two keying nodes extract the phase randomness of the fading channel with the aid of relay node(s). For the first time, we explicitly consider the effect of estimation methods on the extraction of secret key bits from the underlying fading channels and focus on a popular statistical method--maximum likelihood estimation (MLE). The performance of the cooperative key generation scheme is extensively evaluated theoretically. We successfully establish both a theoretical upper bound on the maximum secret key rate from mutual information of correlated random sources and a more practical upper bound from Cramer-Rao bound (CRB) in estimation theory. Numerical examples and simulation studies are also presented to demonstrate the performance of the cooperative key generation system. The results show that the key rate can be improved by a couple of orders of magnitude compared to the existing approaches.

Connected through hyperedge HE-1 (induced by source paper "design and implementation of secret key agreement for platoon based vehicular cyber physical systems"):
  with members:
    - "h2b heartbeat based secret key generation using piezo vibration sensors"
    - "lcd low latency command dissemination for a platoon of vehicles"
    - "nonreciprocity compensation combined with turbo codes for secret key generation in vehicular ad hoc social iot networks"
    - "exploiting channel diversity in secret key generation from multipath fading randomness"

Connected through hyperedge HE-2 (induced by source paper "physical layer secret key generation in static environments"):
  with members:
    - "distributed multi user secret sharing"
    - "a novel millimeter wave channel simulator and applications for 5g wireless communications"
    - "exploiting channel diversity in secret key generation from multipath fading randomness"

Connected through hyperedge HE-3 (induced by source paper "channel whispering a protocol for physical layer group key generation application to ir uwb through deconvolution"):
  with members:
    - "group secret key generation algorithms"

Connected through hyperedge HE-4 (induced by source paper "multi message authentication over noisy channel with secure channel codes"):
  with members:
    - "on the error region for channel estimation based physical layer authentication over rayleigh fading"
    - "on the optimality of keyless authentication in a noisy model"
    - "message authentication code over a wiretap channel"
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "strong secrecy on the binary erasure wiretap channel using large girth ldpc codes"
    - "strong secrecy for erasure wiretap channels"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-5 (induced by source paper "a survey on wireless security technical challenges recent advances and future trends"):
  with members:
    - "relay selection for wireless communications against eavesdropping a security reliability trade off perspective"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "securing physical layer communications for cognitive radio networks"
    - "secrecy outage and diversity analysis of cognitive radio systems"
    - "security versus reliability analysis of opportunistic relaying"
    - "what will 5g be"
    - "intercept probability analysis of cooperative wireless networks with best relay selection in the presence of eavesdropping attack"
    - "optimal relay selection for physical layer security in cooperative wireless networks"

Connected through hyperedge HE-6 (induced by source paper "the private key capacity of a cooperative pairwise independent network"):
  with members:
    - "the capacity region of the source type model for secret key and private key generation"
    - "secret key generation for a pairwise independent network model"
    - "information theoretically secret key generation for fading wireless channels"
    - "group secret key generation algorithms"

Connected through hyperedge HE-7 (induced by source paper "secret key generation based on aoa estimation for low snr conditions"):
  with members:
    - "a simple aoa estimation scheme"

Connected through hyperedge HE-8 (induced by source paper "the effect of eavesdropper s statistics in experimental wireless secret key generation"):
  with members:
    - "separation of reliability and secrecy in rate limited secret key generation"
    - "strong secrecy from channel resolvability"
    - "information theoretically secret key generation for fading wireless channels"

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)