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: "exploiting channel diversity in secret key generation from multipath fading randomness"
  Abstract: We design and analyze a method to extract secret keys from the randomness inherent to wireless channels. We study a channel model for a multipath wireless channel and exploit the channel diversity in generating secret key bits. We compare the key extraction methods based both on entire channel state information (CSI) and on single channel parameter such as the received signal strength indicators (RSSI). Due to the reduction in the degree-of-freedom when going from CSI to RSSI, the rate of key extraction based on CSI is far higher than that based on RSSI. This suggests that exploiting channel diversity and making CSI information available to higher layers would greatly benefit the secret key generation. We propose a key generation system based on low-density parity-check (LDPC) codes and describe the design and performance of two systems: one based on binary LDPC codes and the other (useful at higher signal-to-noise ratios) based on four-ary LDPC codes.

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"
    - "cooperative secret key generation from phase estimation in narrowband fading channels"

Connected through hyperedge HE-2 (induced by source paper "group secret key generation using algebraic rings in wireless networks"):
  with members:
    - "insider attacks on physical layer group secret key generation in wireless networks"
    - "secret key generation from gaussian sources using lattice hashing"
    - "information theoretically secret key generation for fading wireless channels"
    - "group secret key generation algorithms"

Connected through hyperedge HE-3 (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"
    - "cooperative secret key generation from phase estimation in narrowband fading channels"

Connected through hyperedge HE-4 (induced by source paper "survey and systematization of secure device pairing"):
  with members:
    - "demo of bandana body area network device to device authentication using natural gait"
    - "rapid user transparent and trustworthy device pairing for d2d enabled mobile crowdsourcing"
    - "walk unlock zero interaction authentication protected with multi modal gait biometrics"
    - "challenges in mobile multi device ecosystems"
    - "when theory and reality collide demystifying the effectiveness of ambient sensing for nfc based proximity detection by applying relay attack data"
    - "stash securing transparent authentication schemes using prover side proximity verification"
    - "contextual proximity detection in the face of context manipulating adversaries"
    - "pitfalls in designing zero effort deauthentication opportunistic human observation attacks"

Connected through hyperedge HE-5 (induced by source paper "group secret key generation using algebraic rings in three user wireless networks"):
  with members:
    - "insider attacks on physical layer group secret key generation in wireless networks"
    - "the effect of eavesdropper s statistics in experimental wireless secret key generation"
    - "secret key generation from gaussian sources using lattice hashing"
    - "information theoretically secret key generation for fading wireless channels"
    - "two hop secure communication using an untrusted relay"
    - "group secret key generation algorithms"

Connected through hyperedge HE-6 (induced by source paper "the passive eavesdropper affects my channel secret key rates under real world conditions extended version"):
  with members:
    - "the effect of eavesdropper s statistics in experimental wireless secret key generation"

Connected through hyperedge HE-7 (induced by source paper "secret key agreement with large antenna arrays under the pilot contamination attack"):
  with members:
    - "the sender excited secret key agreement model capacity reliability and secrecy exponents"
    - "secure transmission in multi cell massive mimo systems"
    - "secrecy sum rates for multi user mimo regularized channel inversion precoding"
    - "secret sharing ldpc codes for the bpsk constrained gaussian wiretap channel"
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "channel estimation and linear precoding in multiuser multiple antenna tdd systems"
    - "polar coding for secure transmission and key agreement"
    - "nested polar codes for wiretap and relay channels"

Connected through hyperedge HE-8 (induced by source paper "full duplex vs half duplex secret key generation"):
  with members:
    - "the sender excited secret key agreement model capacity reliability and secrecy exponents"
    - "key capacity with limited one way communication for product sources"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "full duplex transceiver system calculations analysis of adc and linearity challenges"
    - "rate gain region and design tradeoffs for full duplex wireless communications"
    - "multiaccess channel with partially cooperating encoders and security constraints"
    - "separation of reliability and secrecy in rate limited secret key generation"
    - "secret key agreement from correlated gaussian sources by rate limited public communication"

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)