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: "inferring fine grained control flow inside sgx enclaves with branch shadowing"
  Abstract: In this paper, we explore a new, yet critical, side-channel attack against Intel Software Guard Extension (SGX), called a branch shadowing attack, which can reveal fine-grained control flows (i.e., each branch) of an enclave program running on real SGX hardware. The root cause of this attack is that Intel SGX does not clear the branch history when switching from enclave mode to non-enclave mode, leaving the fine-grained traces to the outside world through a branch-prediction side channel. However, exploiting the channel is not so straightforward in practice because 1) measuring branch prediction/misprediction penalties based on timing is too inaccurate to distinguish fine-grained control-flow changes and 2) it requires sophisticated control over the enclave execution to force its execution to the interesting code blocks. To overcome these challenges, we developed two novel exploitation techniques: 1) Intel PT- and LBR-based history-inferring techniques and 2) APIC-based technique to control the execution of enclave programs in a fine-grained manner. As a result, we could demonstrate our attack by breaking recent security constructs, including ORAM schemes, Sanctum, SGX-Shield, and T-SGX. Not limiting our work to the attack itself, we thoroughly studied the feasibility of hardware-based solutions (e.g., branch history clearing) and also proposed a software-based countermeasure, called Zigzagger, to mitigate the branch shadowing attack in practice.

Connected through hyperedge HE-1 (induced by source paper "copycat controlled instruction level attacks on enclaves for maximal key extraction"):
  with members:
    - "tpm fail tpm meets timing and lattice attacks"
    - "dr sgx automated and adjustable side channel protection for sgx using data location randomization"
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "hybcache hybrid side channel resilient caches for trusted execution environments"
    - "mitigating branch shadowing attacks on intel sgx using control flow randomization"
    - "microwalk a framework for finding side channels in binaries"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "software grand exposure sgx cache attacks are practical"

Connected through hyperedge HE-2 (induced by source paper "code renewability for native software protection"):
  with members:
    - "software grand exposure sgx cache attacks are practical"

Connected through hyperedge HE-3 (induced by source paper "context leakage free transient execution"):
  with members:
    - "fallout reading kernel writes from user space"
    - "spectre is here to stay an analysis of side channels and speculative execution"
    - "store to leak forwarding leaking data on meltdown resistant cpus"
    - "zombieload cross privilege boundary data sampling"
    - "speculative buffer overflows attacks and defenses"
    - "netspectre read arbitrary memory over network"
    - "safespec banishing the spectre of a meltdown with leakage free speculation"
    - "meltdownprime and spectreprime automatically synthesized attacks exploiting invalidation based coherence protocols"

Connected through hyperedge HE-4 (induced by source paper "sok hardware security support for trustworthy execution"):
  with members:
    - "secloak arm trustzone based mobile peripheral control"
    - "reverse engineering x86 processor microcode"
    - "extracting secrets from encrypted virtual machines"
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "spectre attacks exploiting speculative execution"
    - "pac it up towards pointer integrity using arm pointer authentication"
    - "lord of the x86 rings a portable user mode privilege separation architecture on x86"
    - "severed subverting amd s virtual machine encryption"

Connected through hyperedge HE-5 (induced by source paper "helen maliciously secure coopetitive learning for linear models"):
  with members:
    - "drynx decentralized secure verifiable system for statistical queries and machine learning on distributed datasets"
    - "fine pruning defending against backdooring attacks on deep neural networks"
    - "spectre attacks exploiting speculative execution"
    - "the secret sharer measuring unintended neural network memorization extracting secrets"
    - "manipulating machine learning poisoning attacks and countermeasures for regression learning"
    - "chameleon a hybrid secure computation framework for machine learning applications"
    - "gazelle a low latency framework for secure neural network inference"
    - "prio private robust and scalable computation of aggregate statistics"

Connected through hyperedge HE-6 (induced by source paper "hybcache hybrid side channel resilient caches for trusted execution environments"):
  with members:
    - "speculative buffer overflows attacks and defenses"
    - "spectre attacks exploiting speculative execution"
    - "spectre returns speculation attacks using the return stack buffer"
    - "ret2spec speculative execution using return stack buffers"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "software grand exposure sgx cache attacks are practical"
    - "malware guard extension using sgx to conceal cache attacks"
    - "a software approach to defeating side channels in last level caches"

Connected through hyperedge HE-7 (induced by source paper "dr sgx automated and adjustable side channel protection for sgx using data location randomization"):
  with members:
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "hybcache hybrid side channel resilient caches for trusted execution environments"
    - "spectre attacks exploiting speculative execution"
    - "lazyfp leaking fpu register state using microarchitectural side channels"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "software grand exposure sgx cache attacks are practical"
    - "malware guard extension using sgx to conceal cache attacks"
    - "stacco differentially analyzing side channel traces for detecting ssl tls vulnerabilities in secure enclaves"

Connected through hyperedge HE-8 (induced by source paper "teevil identity lease via trusted execution environments"):
  with members:
    - "stay on topic generating context specific fake restaurant reviews"
    - "fake news detection on social media a data mining perspective"
    - "software grand exposure sgx cache attacks are practical"
    - "rollback and forking detection for trusted execution environments using lightweight collective memory"
    - "automated crowdturfing attacks and defenses in online review systems"
    - "debunking in a world of tribes"
    - "can cascades be predicted"
    - "viral misinformation the role of homophily and polarization"

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)