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: "did we learn from llc side channel attacks a cache leakage detection tool for crypto libraries"
  Abstract: This work presents a new tool to verify the correctness of cryptographic implementations with respect to cache attacks. Our methodology discovers vulnerabilities that are hard to find with other techniques, observed as exploitable leakage. The methodology works by identifying secret dependent memory and introducing forced evictions inside potentially vulnerable code to obtain cache traces that are analyzed using Mutual Information. If dependence is observed, the cryptographic implementation is classified as to leak information. #R##N#We demonstrate the viability of our technique in the design of the three main cryptographic primitives, i.e., AES, RSA and ECC, in eight popular up to date cryptographic libraries, including OpenSSL, Libgcrypt, Intel IPP and NSS. Our results show that cryptographic code designers are far away from incorporating the appropriate countermeasures to avoid cache leakages, as we found that 50% of the default implementations analyzed leaked information that lead to key extraction. We responsibly notified the designers of all the leakages found and suggested patches to solve these vulnerabilities.

Connected through hyperedge HE-1 (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-2 (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"
    - "a software approach to defeating side channels in last level caches"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"
    - "rigorous analysis of software countermeasures against cache attacks"
    - "flush flush a fast and stealthy cache attack"

Connected through hyperedge HE-3 (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"
    - "malware guard extension using sgx to conceal cache attacks"
    - "rigorous analysis of software countermeasures against cache attacks"
    - "armageddon cache attacks on mobile devices"
    - "determinating timing channels in compute clouds"

Connected through hyperedge HE-4 (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"
    - "perfweb how to violate web privacy with hardware performance events"
    - "stacco differentially analyzing side channel traces for detecting ssl tls vulnerabilities in secure enclaves"
    - "rigorous analysis of software countermeasures against cache attacks"
    - "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)