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: "mi6 secure enclaves in a speculative out of order processor"
  Abstract: Recent attacks have broken process isolation by exploiting microarchitectural side channels that allow indirect access to shared microarchitectural state. Enclaves strengthen the process abstraction to restore isolation guarantees. #R##N#We propose MI6, an aggressive, speculative out-of-order processor capable of providing secure enclaves under a threat model that includes an untrusted OS and an attacker capable of mounting any software attack currently considered practical, including control flow speculation attacks. MI6 is inspired by Sanctum [16] and extends its isolation guarantee to more realistic memory hierarchies. It also introduces a purge instruction, which is used only when a secure process is scheduled, and implements it for a complex processor microarchitecture. We model the performance impact of enclaves in MI6 through FPGA emulation on AWS F1 FPGAs by running SPEC CINT2006 benchmarks on top of an untrusted Linux OS. Security comes at the cost of approximately 16.4% average slowdown for protected programs.

Connected through hyperedge HE-1 (induced by source paper "ironhide a secure multicore that efficiently mitigates microarchitecture state attacks for interactive applications"):
  with members:
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"

Connected through hyperedge HE-2 (induced by source paper "keystone an open framework for architecting tees"):
  with members:
    - "ekiden a platform for confidentiality preserving trustworthy and performant smart contracts"
    - "zombieload cross privilege boundary data sampling"
    - "practical verifiable in network filtering for ddos defense"
    - "sanctorum a lightweight security monitor for secure enclaves"
    - "spectre attacks exploiting speculative execution"
    - "besfs mechanized proof of an iago safe filesystem for enclaves"
    - "privado practical and secure dnn inference"
    - "teechan payment channels using trusted execution environments"

Connected through hyperedge HE-3 (induced by source paper "ironhide a secure multicore architecture that leverages hardware isolation against microarchitecture state attacks"):
  with members:
    - "speculative buffer overflows attacks and defenses"
    - "sanctorum a lightweight security monitor for secure enclaves"
    - "spectre attacks exploiting speculative execution"
    - "connecting the dots privacy leakage via write access patterns to the main memory"
    - "a software approach to defeating side channels in last level caches"
    - "armageddon cache attacks on mobile devices"
    - "thermal covert channels on multi core platforms"

Connected through hyperedge HE-4 (induced by source paper "lookout for zombies mitigating flush reload attack on shared caches by monitoring invalidated lines"):
  with members:
    - "a software approach to defeating side channels in last level caches"
    - "flush flush a fast and stealthy cache attack"
    - "flush flush a fast and stealthy cache attack"
    - "drama exploiting dram addressing for cross cpu attacks"

Connected through hyperedge HE-5 (induced by source paper "a benchmark suite for evaluating caches vulnerability to timing attacks"):
  with members:
    - "leaking information through cache lru states"

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.CR(Cryptography and Security)