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: "rigorous analysis of software countermeasures against cache attacks"
  Abstract: CPU caches introduce variations into the execution time of programs that can be exploited by adversaries to recover private information about users or cryptographic keys. Establishing the security of countermeasures against this threat often requires intricate reasoning about the interactions of program code, memory layout, and hardware architecture and has so far only been done for restricted cases. In this paper we devise novel techniques that provide support for bit-level and arithmetic reasoning about memory accesses in the presence of dynamic memory allocation. These techniques enable us to perform the first rigorous analysis of widely deployed software countermeasures against cache attacks on modular exponentiation, based on executable code.

Connected through hyperedge HE-1 (induced by source paper "specusym speculative symbolic execution for cache timing leak detection"):
  with members:
    - "mitigating power side channels during compilation"
    - "specfuzz bringing spectre type vulnerabilities to the surface"
    - "identifying cache based side channels through secret augmented abstract interpretation"
    - "neural network model extraction attacks in edge devices by hearing architectural hints"
    - "abstract interpretation under speculative execution"
    - "ct fuzz fuzzing for timing leaks"
    - "savior towards bug driven hybrid testing"
    - "spoiler speculative load hazards boost rowhammer and cache attacks"

Connected through hyperedge HE-2 (induced by source paper "revisiting and evaluating software side channel vulnerabilities and countermeasures in cryptographic applications"):
  with members:
    - "when human cognitive modeling meets pins user independent inter keystroke timing attacks"
    - "identifying cache based side channels through secret augmented abstract interpretation"
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "spoiler speculative load hazards boost rowhammer and cache attacks"
    - "meltdownprime and spectreprime automatically synthesized attacks exploiting invalidation based coherence protocols"
    - "verifying and synthesizing constant resource implementations with types"
    - "spectre attacks exploiting speculative execution"
    - "robust website fingerprinting through the cache occupancy channel"

Connected through hyperedge HE-3 (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-4 (induced by source paper "memjam a false dependency attack against constant time crypto implementations"):
  with members:
    - "ozone efficient execution with zero timing leakage for modern microarchitectures"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "cacheshield protecting legacy processes against cache attacks"
    - "software grand exposure sgx cache attacks are practical"
    - "did we learn from llc side channel attacks a cache leakage detection tool for crypto libraries"
    - "a software approach to defeating side channels in last level caches"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"
    - "flush flush a fast and stealthy cache attack"

Connected through hyperedge HE-5 (induced by source paper "binsec rel efficient relational symbolic execution for constant time at binary level"):
  with members:
    - "get rid of inline assembly through verification oriented lifting"
    - "symbolic verification of cache side channel freedom"
    - "eliminating timing side channel leaks using program repair"
    - "microwalk a framework for finding side channels in binaries"
    - "time protection the missing os abstraction"
    - "relational symbolic execution"
    - "a software approach to defeating side channels in last level caches"

Connected through hyperedge HE-6 (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"
    - "armageddon cache attacks on mobile devices"
    - "determinating timing channels in compute clouds"

Connected through hyperedge HE-7 (induced by source paper "ct fuzz fuzzing for timing leaks"):
  with members:
    - "eliminating timing side channel leaks using program repair"
    - "canal a cache timing analysis framework via llvm transformation"

Connected through hyperedge HE-8 (induced by source paper "microwalk a framework for finding side channels in binaries"):
  with members:
    - "spectre attacks exploiting speculative execution"
    - "ozone efficient execution with zero timing leakage for modern microarchitectures"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "did we learn from llc side channel attacks a cache leakage detection tool for crypto libraries"
    - "perfweb how to violate web privacy with hardware performance events"
    - "stacco differentially analyzing side channel traces for detecting ssl tls vulnerabilities in secure enclaves"
    - "armageddon cache attacks on mobile devices"

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)