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: "x search revisiting private web search using intel sgx"
  Abstract: The exploitation of user search queries by search engines is at the heart of their economic model. As consequence, offering private Web search functionalities is essential to the users who care about their privacy. Nowadays, there exists no satisfactory approach to enable users to access search engines in a privacy-preserving way. Existing solutions are either too costly due to the heavy use of cryptographic mechanisms (e.g., private information retrieval protocols), subject to attacks (e.g., Tor, TrackMeNot, GooPIR) or rely on weak adversarial models (e.g., PEAS). This paper introduces X-S earch , a novel private Web search mechanism building on the disruptive Software Guard Extensions (SGX) proposed by Intel. We compare X-S earch  to its closest competitors, Tor and PEAS, using a dataset of real web search queries. Our evaluation shows that: (1) X-S earch  offers stronger privacy guarantees than its competitors as it operates under a stronger adversarial model; (2) it better resists state-of-the-art re-identification attacks; and (3) from the performance perspective, X-S earch  outperforms its competitors both in terms of latency and throughput by orders of magnitude.

Connected through hyperedge HE-1 (induced by source paper "distributed systems and trusted execution environments trade offs and challenges"):
  with members:
    - "supply chain malware targets sgx take care of what you sign"
    - "anonymous and confidential file sharing over untrusted clouds"
    - "sgx lkl securing the host os interface for trusted execution"
    - "smotherspectre exploiting speculative execution through port contention"
    - "streambox tz secure stream analytics at the edge with trustzone"
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "cyclosa decentralizing private web search through sgx based browser extensions"
    - "ibbe sgx cryptographic group access control using trusted execution environments"

Connected through hyperedge HE-2 (induced by source paper "security performance and energy trade offs of hardware assisted memory protection mechanisms"):
  with members:
    - "short paper stress sgx load and stress your enclaves for fun and profit"
    - "snort intrusion detection system with intel software guard extension intel sgx"
    - "severed subverting amd s virtual machine encryption"
    - "securestreams a reactive middleware framework for secure data stream processing"
    - "trustshadow secure execution of unmodified applications with arm trustzone"
    - "software grand exposure sgx cache attacks are practical"
    - "secure content based routing using intel software guard extensions"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"

Connected through hyperedge HE-3 (induced by source paper "pubsub sgx exploiting trusted execution environments for privacy preserving publish subscribe systems"):
  with members:
    - "securestreams a reactive middleware framework for secure data stream processing"
    - "secure and privacy aware data dissemination for cloud based applications"
    - "secure content based routing using intel software guard extensions"
    - "teechan payment channels using trusted execution environments"

Connected through hyperedge HE-4 (induced by source paper "cyclosa decentralizing private web search through sgx based browser extensions"):
  with members:
    - "sgxio generic trusted i o path for intel sgx"

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)