human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "teechain a secure asynchronous blockchain payment network"):
  Abstract: Blockchain protocols exchange payment transactions securely, but their performance is limited by the need to achieve global consensus. Payment networks, as a second layer on top of blockchains, allow more efficient payments between parties. Existing payment networks, however, are fundamentally insecure: they assume synchronous blockchain access, i.e., that participants can write transactions to the blockchain within bounded time. As shown recently, attackers can delay transactions with current blockchains, which only offer best-effort write latencies, and thus steal funds. #R##N#We describe Teechain, the first layer-two payment network that only requires asynchronous blockchain access. Teechain exploits trusted execution environments (TEEs) in modern CPUs: Teechain constructs a decentralised network of TEEs and uses TEEs to secure collateral funds in payment channels without further interaction with the blockchain. Since TEEs provide no availability guarantees and may be compromised themselves, Teechain mitigates against Byzantine TEE failures through a novel combination of chain replication and threshold secret sharing. Teechain achieves at least 33x higher transaction throughput than the Lightning Network with similar latencies, while placing 75% fewer transactions on the blockchain in the common case. A Teechain deployment with 30 machines can handle over 1 million Bitcoin transactions per second.

Includes members:
  Member "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "on the convergence of artificial intelligence and distributed ledger technology a scoping review and future research agenda")
  Member "hyperledger fabric a distributed operating system for permissioned blockchains":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "tenderbake classical bft style consensus for public blockchains")
  Member "cachezoom how sgx amplifies the power of cache attacks":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "copycat controlled instruction level attacks on enclaves for maximal key extraction")
  Member "the nuts and bolts of micropayments a survey":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "teechain a secure payment network with asynchronous blockchain access")
  Member "software grand exposure sgx cache attacks are practical":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "distributed systems and trusted execution environments trade offs and challenges")
  Member "rollback and forking detection for trusted execution environments using lightweight collective memory":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "blockchains a systematic multivocal literature review")
  Member "teechan payment channels using trusted execution environments":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "keystone an open framework for architecting tees")
  Member "enhancing bitcoin security and performance with strong consistency via collective signing":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "surface a practical blockchain consensus algorithm for real world networks")

Question: Please tell me which class the source paper 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)