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: "non determinism in byzantine fault tolerant replication"
  Abstract: Service replication distributes an application over many processes for tolerating faults, attacks, and misbehavior among a subset of the processes. The established state-machine replication paradigm inherently requires the application to be deterministic. This paper distinguishes three models for dealing with non-determinism in replicated services, where some processes are subject to faults and arbitrary behavior (so-called Byzantine faults): first, a modular approach that does not require any changes to the potentially non-deterministic application (and neither access to its internal data); second, a master-slave approach, in which ties are broken by a leader and the other processes validate the choices of the leader; and finally, a treatment of applications that use cryptography and secret keys. Cryptographic operations and secrets must be treated specially because they require strong randomness to satisfy their goals. #R##N#The paper also introduces two new protocols. The first uses the modular approach for filtering out non-de\-ter\-min\-istic operations in an application. It ensures that all correct processes produce the same outputs and that their internal states do not diverge. The second protocol implements cryptographically secure randomness generation with a verifiable random function and is appropriate for certain security models. All protocols are described in a generic way and do not assume a particular implementation of the underlying consensus primitive.

Connected through hyperedge HE-1 (induced by source paper "in search for a linear byzantine agreement"):
  with members:
    - "cogsworth byzantine view synchronization"
    - "ace abstract consensus encapsulation for liveness boosting of state machine replication"
    - "flexible byzantine fault tolerance"
    - "the latest gossip on bft consensus"
    - "byzantine agreement with optimal early stopping optimal resilience and polynomial complexity"
    - "breaking the o n 2 bit barrier scalable byzantine agreement with an adaptive adversary"

Connected through hyperedge HE-2 (induced by source paper "blockchain for future smart grid a comprehensive survey"):
  with members:
    - "exploring the attack surface of blockchain a systematic overview"
    - "an efficient blockchain based hierarchical authentication mechanism for energy trading in v2g environment"
    - "when energy trading meets blockchain in electrical power system the state of the art"
    - "energy crowdsourcing and peer to peer energy trading in blockchain enabled smart grids"
    - "blockchain based grid operation services for transactive energy systems"
    - "blockchain technologies for smart energy systems fundamentals challenges and solutions"
    - "key management systems for smart grid advanced metering infrastructure a survey"
    - "a survey on the security of blockchain systems"

Connected through hyperedge HE-3 (induced by source paper "adapting persistent data structures for concurrency and speculation"):
  with members:
    - "distributionally linearizable data structures"
    - "pam parallel augmented maps"
    - "pragmatic primitives for non blocking data structures"
    - "techniques for constructing efficient lock free data structures"
    - "a general technique for non blocking trees"
    - "well structured futures and cache locality"
    - "flat combining and the synchronization parallelism tradeoff"
    - "a critique of ansi sql isolation levels"

Connected through hyperedge HE-4 (induced by source paper "design and evaluation of smart contract based system operations for permissioned blockchain based systems"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "applying software patterns to address interoperability in blockchain based healthcare apps"
    - "blockchain oriented software engineering challenges and new directions"
    - "a byzantine fault tolerant ordering service for the hyperledger fabric blockchain platform"

Connected through hyperedge HE-5 (induced by source paper "a review on the application of blockchain for the next generation of cybersecure industry 4 0 smart factories"):
  with members:
    - "user centric privacy engineering for the internet of things"
    - "when can a distributed ledger replace a trusted third party"
    - "a survey on security and privacy issues of bitcoin"

Connected through hyperedge HE-6 (induced by source paper "hyperledger fabric a distributed operating system for permissioned blockchains"):
  with members:
    - "blockchains consensus protocols in the wild"
    - "a byzantine fault tolerant ordering service for the hyperledger fabric blockchain platform"
    - "untangling blockchain a data processing view of blockchain systems"
    - "xft practical fault tolerance beyond crashes"

Connected through hyperedge HE-7 (induced by source paper "consensus in the age of blockchains"):
  with members:
    - "implicit consensus blockchain with unbounded throughput"
    - "blockchains consensus protocols in the wild"
    - "chainspace a sharded smart contracts platform"
    - "practical synchronous byzantine consensus"
    - "blockbench a framework for analyzing private blockchains"
    - "interactive proof of stake"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "service oriented sharding with aspen"

Connected through hyperedge HE-8 (induced by source paper "adding concurrency to smart contracts"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"

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.DC(Distributed, Parallel, and Cluster Computing)