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: "obladi oblivious serializable transactions in the cloud"
  Abstract: This paper presents the design and implementation of Obladi, the first system to provide ACID transactions while also hiding access patterns. Obladi uses as its building block oblivious RAM, but turns the demands of supporting transactions into a performance opportunity. By executing transactions within epochs and delaying commit decisions until an epoch ends, Obladi reduces the amortized bandwidth costs of oblivious storage and increases overall system throughput. These performance gains, combined with new oblivious mechanisms for concurrency control and recovery, allow Obladi to execute OLTP workloads with reasonable throughput: it comes within 5x to 12x of a non-oblivious baseline on the TPC-C, SmallBank, and FreeHealth applications. Latency overheads, however, are higher (70x on TPC-C).

Connected through hyperedge HE-1 (induced by source paper "sgx lkl securing the host os interface for trusted execution"):
  with members:
    - "keystone an open framework for architecting tees"
    - "dr sgx automated and adjustable side channel protection for sgx using data location randomization"
    - "zombieload cross privilege boundary data sampling"
    - "interface based side channel attack against intel sgx"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "oblidb oblivious query processing for secure databases"
    - "software grand exposure sgx cache attacks are practical"
    - "prochlo strong privacy for analytics in the crowd"

Connected through hyperedge HE-2 (induced by source paper "pacer network side channel mitigation in the cloud"):
  with members:
    - "measuring information leakage in website fingerprinting attacks and defenses"
    - "netspectre read arbitrary memory over network"
    - "loophole timing attacks on shared event loops in chrome"
    - "mitigating timing side channel in shared schedulers"
    - "robust and efficient elimination of cache and timing side channels"
    - "drama exploiting dram addressing for cross cpu attacks"
    - "k fingerprinting a robust scalable website fingerprinting technique"
    - "deterministically deterring timing attacks in deterland"

Connected through hyperedge HE-3 (induced by source paper "a double edged sword security threats and opportunities in one sided network communication"):
  with members:
    - "the end of a myth distributed transactions can scale"
    - "rowhammer js a remote software induced fault attack in javascript"
    - "privacy preserving group data access via stateless oblivious ram simulation"
    - "towards practical oblivious ram"
    - "privacy preserving access of outsourced data via oblivious ram simulation"

Connected through hyperedge HE-4 (induced by source paper "star scaling transactions through asymmetric replication"):
  with members:
    - "rethinking serializable multiversion concurrency control"
    - "high performance concurrency control mechanisms for main memory databases"

Connected through hyperedge HE-5 (induced by source paper "scar strong consistency using asynchronous replication with minimal coordination"):
  with members:
    - "efficiently making almost any concurrency control mechanism serializable"
    - "a critique of ansi sql isolation levels"

Connected through hyperedge HE-6 (induced by source paper "oblidb oblivious query processing for secure databases"):
  with members:
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "the pyramid scheme oblivious ram for trusted processors"
    - "stealthdb a scalable encrypted database with full sql query support"
    - "software grand exposure sgx cache attacks are practical"
    - "prochlo strong privacy for analytics in the crowd"
    - "sok cryptographically protected database search"
    - "hardidx practical and secure index with sgx"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"

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)