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: "spectre returns speculation attacks using the return stack buffer"
  Abstract: The recent Spectre attacks exploit speculative execution, a pervasively used feature of modern microprocessors, to allow the exfiltration of sensitive data across protection boundaries. In this paper, we introduce a new Spectre-class attack that we call SpectreRSB. In particular, rather than exploiting the branch predictor unit, SpectreRSB exploits the return stack buffer (RSB), a common predictor structure in modern CPUs used to predict return addresses. We show that both local attacks (within the same process such as Spectre 1) and attacks on SGX are possible by constructing proof of concept attacks. We also analyze additional types of the attack on the kernel or across address spaces and show that under some practical and widely used conditions they are possible. Importantly, none of the known defenses including Retpoline and Intel's microcode patches stop all SpectreRSB attacks. We believe that future system developers should be aware of this vulnerability and consider it in developing defenses against speculation attacks. In particular, on Core-i7 Skylake and newer processors (but not on Intel's Xeon processor line), a patch called RSB refilling is used to address a vulnerability when the RSB underfills; this defense interferes with SpectreRSB's ability to launch attacks that switch into the kernel. We recommend that this patch should be used on all machines to protect against SpectreRSB.

Connected through hyperedge HE-1 (induced by source paper "ghostknight breaching data integrity via speculative execution"):
  with members:
    - "telehammer a stealthy cross boundary rowhammer technique"
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "netspectre read arbitrary memory over network"
    - "spectre attacks exploiting speculative execution"
    - "nethammer inducing rowhammer faults through network requests"
    - "ret2spec speculative execution using return stack buffers"
    - "a systematic evaluation of transient execution attacks and defenses"
    - "another flip in the wall of rowhammer defenses"

Connected through hyperedge HE-2 (induced by source paper "bypassing memory safety mechanisms through speculative control flow hijacks"):
  with members:
    - "smotherspectre exploiting speculative execution through port contention"
    - "spectre is here to stay an analysis of side channels and speculative execution"
    - "speculative buffer overflows attacks and defenses"
    - "ret2spec speculative execution using return stack buffers"
    - "a systematic evaluation of transient execution attacks and defenses"

Connected through hyperedge HE-3 (induced by source paper "store to leak forwarding leaking data on meltdown resistant cpus"):
  with members:
    - "practical enclave malware with intel sgx"
    - "smotherspectre exploiting speculative execution through port contention"
    - "page cache attacks"
    - "spoiler speculative load hazards boost rowhammer and cache attacks"
    - "speculative buffer overflows attacks and defenses"
    - "netspectre read arbitrary memory over network"
    - "meltdownprime and spectreprime automatically synthesized attacks exploiting invalidation based coherence protocols"
    - "spectre attacks exploiting speculative execution"

Connected through hyperedge HE-4 (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-5 (induced by source paper "zombieload cross privilege boundary data sampling"):
  with members:
    - "smotherspectre exploiting speculative execution through port contention"
    - "fallout reading kernel writes from user space"
    - "store to leak forwarding leaking data on meltdown resistant cpus"
    - "spoiler speculative load hazards boost rowhammer and cache attacks"
    - "speculative buffer overflows attacks and defenses"
    - "netspectre read arbitrary memory over network"
    - "spectector principled detection of speculative information flows"
    - "spectre attacks exploiting speculative execution"

Connected through hyperedge HE-6 (induced by source paper "speccfi mitigating spectre attacks using cfi informed speculation"):
  with members:
    - "context leakage free transient execution"
    - "smotherspectre exploiting speculative execution through port contention"
    - "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"
    - "spectre attacks exploiting speculative execution"

Connected through hyperedge HE-7 (induced by source paper "towards constant time foundations for the new spectre era"):
  with members:
    - "abstract interpretation under speculative execution"
    - "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"
    - "spoiler speculative load hazards boost rowhammer and cache attacks"
    - "inspectre breaking and fixing microarchitectural vulnerabilities by formal analysis"
    - "eliminating timing side channel leaks using program repair"
    - "speculative buffer overflows attacks and defenses"

Connected through hyperedge HE-8 (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"
    - "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"
    - "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.CR(Cryptography and Security)