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: "proof of luck an efficient blockchain consensus protocol"
  Abstract: In the paper, we present designs for multiple blockchain consensus primitives and a novel blockchain system, all based on the use of trusted execution environments (TEEs), such as Intel SGX-enabled CPUs. First, we show how using TEEs for existing proof of work schemes can make mining equitably distributed by preventing the use of ASICs. Next, we extend the design with proof of time and proof of ownership consensus primitives to make mining energy- and time-efficient. Further improving on these designs, we present a blockchain using a proof of luck consensus protocol. Our proof of luck blockchain uses a TEE platform's random number generation to choose a consensus leader, which offers low-latency transaction validation, deterministic confirmation time, negligible energy consumption, and equitably distributed mining. Lastly, we discuss a potential protection against up to a constant number of compromised TEEs.

Connected through hyperedge HE-1 (induced by source paper "on the convergence of artificial intelligence and distributed ledger technology a scoping review and future research agenda"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "energy recycling blockchain with proof of deep learning"
    - "decentralized and collaborative ai on blockchain"
    - "sok transparent dishonesty front running attacks on blockchain"
    - "reliable federated learning for mobile networks"
    - "keystone an open framework for architecting tees"
    - "tensorscone a secure tensorflow framework using intel sgx"
    - "coin ai a proof of useful work scheme for blockchain based distributed deep learning"

Connected through hyperedge HE-2 (induced by source paper "sok of used cryptography in blockchain"):
  with members:
    - "sef a secure fountain architecture for slashing storage costs in blockchains"
    - "dfinity technology overview series consensus system"
    - "celer network bring internet scale to every blockchain"
    - "raziel private and verifiable smart contracts on blockchains"
    - "blendcac a blockchain enabled decentralized capability based access control for iots"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "a survey on security and privacy issues of bitcoin"
    - "privacy preserving and efficient aggregation based on blockchain for power grid communications in smart communities"

Connected through hyperedge HE-3 (induced by source paper "deconstructing blockchains a comprehensive survey on consensus membership and structure"):
  with members:
    - "dfinity technology overview series consensus system"
    - "analysis of the xrp ledger consensus protocol"
    - "hotstuff bft consensus in the lens of blockchain"
    - "evaluating the red belly blockchain"
    - "an empirical analysis of anonymity in zcash"
    - "a survey on security and privacy issues of bitcoin"
    - "blockchains consensus protocols in the wild"
    - "cachezoom how sgx amplifies the power of cache attacks"

Connected through hyperedge HE-4 (induced by source paper "an off chip attack on hardware enclaves via the memory bus"):
  with members:
    - "keystone an open framework for architecting tees"
    - "zombieload cross privilege boundary data sampling"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "software grand exposure sgx cache attacks are practical"
    - "rollback and forking detection for trusted execution environments using lightweight collective memory"
    - "malware guard extension using sgx to conceal cache attacks"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"
    - "flush flush a fast and stealthy cache attack"

Connected through hyperedge HE-5 (induced by source paper "keystone an open framework for architecting tees"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "zombieload cross privilege boundary data sampling"
    - "practical verifiable in network filtering for ddos defense"
    - "sanctorum a lightweight security monitor for secure enclaves"
    - "spectre attacks exploiting speculative execution"
    - "besfs mechanized proof of an iago safe filesystem for enclaves"
    - "privado practical and secure dnn inference"
    - "mi6 secure enclaves in a speculative out of order processor"

Connected through hyperedge HE-6 (induced by source paper "truxen a trusted computing enhanced blockchain"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "blockchain and trusted computing problems pitfalls and a solution for hyperledger fabric"
    - "blockchains consensus protocols in the wild"
    - "decentralized prediction market without arbiters"
    - "teechain a secure asynchronous blockchain payment network"
    - "untangling blockchain a data processing view of blockchain systems"
    - "bitcoin ng a scalable blockchain protocol"
    - "a review of techniques to mitigate sybil attacks"

Connected through hyperedge HE-7 (induced by source paper "trustee full privacy preserving vickrey auction on top of ethereum"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "airtnt fair exchange payment for outsourced secure enclave computations"
    - "blockchain and trusted computing problems pitfalls and a solution for hyperledger fabric"
    - "malware guard extension using sgx to conceal cache attacks"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"
    - "teechan payment channels using trusted execution environments"
    - "ipfs content addressed versioned p2p file system"

Connected through hyperedge HE-8 (induced by source paper "knowledge discovery on blockchains challenges and opportunities"):
  with members:
    - "efficient decentralized deep learning by dynamic model averaging"

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)