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: "determinating timing channels in compute clouds"
  Abstract: Timing side-channels represent an insidious security challenge for cloud computing, because: (a) massive parallelism in the cloud makes timing channels pervasive and hard to control; (b) timing channels enable one customer to steal information from another without leaving a trail or raising alarms; (c) only the cloud provider can feasibly detect and report such attacks, but the provider's incentives are not to; and (d) resource partitioning schemes for timing channel control undermine statistical sharing efficiency, and, with it, the cloud computing business model. We propose a new approach to timing channel control, using provider-enforced deterministic execution instead of resource partitioning to eliminate timing channels within a shared cloud domain. Provider-enforced determinism prevents execution timing from affecting the results of a compute task, however large or parallel, ensuring that a task's outputs leak no timing information apart from explicit timing inputs and total compute duration. Experiments with a prototype OS for deterministic cloud computing suggest that such an approach may be practical and efficient. The OS supports deterministic versions of familiar APIs such as processes, threads, shared memory, and file systems, and runs coarse-grained parallel tasks as efficiently and scalably as current timing channel-ridden systems.

Connected through hyperedge HE-1 (induced by source paper "identifying cache based side channels through secret augmented abstract interpretation"):
  with members:
    - "adversarial symbolic execution for detecting concurrency related cache timing leaks"
    - "microwalk a framework for finding side channels in binaries"
    - "did we learn from llc side channel attacks a cache leakage detection tool for crypto libraries"
    - "malware guard extension using sgx to conceal cache attacks"
    - "rigorous analysis of software countermeasures against cache attacks"
    - "armageddon cache attacks on mobile devices"

Connected through hyperedge HE-2 (induced by source paper "time protection the missing os abstraction"):
  with members:
    - "spectre attacks exploiting speculative execution"
    - "plugging side channel leaks with timing information flow control"

Connected through hyperedge HE-3 (induced by source paper "covert channel detection framework for cloud using distributed machine learning"):
  with members:
    - "seeking black lining in cloud"
    - "covert channel detection using information theory"

Connected through hyperedge HE-4 (induced by source paper "clorofor cloud robust forensics"):
  with members:
    - "cloudsim a novel framework for modeling and simulation of cloud computing infrastructures and services"

Connected through hyperedge HE-5 (induced by source paper "deterministically deterring timing attacks in deterland"):
  with members:
    - "efficient system enforced deterministic parallelism"

Connected through hyperedge HE-6 (induced by source paper "preventing your faults from telling your secrets defenses against pigeonhole attacks"):
  with members:
    - "the spy in the sandbox practical cache attacks in javascript"

Connected through hyperedge HE-7 (induced by source paper "improving hard disk contention based covert channel in cloud computing environment"):
  with members:
    - "principles and overview of network steganography"
    - "is cloud computing steganography proof"

Connected through hyperedge HE-8 (induced by source paper "privacy in sensor driven human data collection a guide for practitioners"):
  with members:
    - "ephpub toward robust ephemeral publishing"

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.OS(Operating Systems)