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: "epistemic temporal logic for information flow security"
  Abstract: Temporal epistemic logic is a well-established framework for expressing agents knowledge and how it evolves over time. Within language-based security these are central issues, for instance in the context of declassification. We propose to bring these two areas together. The paper presents a computational model and an epistemic temporal logic used to reason about knowledge acquired by observing program outputs. This approach is shown to elegantly capture standard notions of noninterference and declassification in the literature as well as information flow properties where sensitive and public data intermingle in delicate ways.

Connected through hyperedge HE-1 (induced by source paper "towards logical specification of statistical machine learning"):
  with members:
    - "statistical epistemic logic"
    - "a formalization of robustness for deep neural networks"
    - "adversarial attacks and defences a survey"
    - "deepxplore automated whitebox testing of deep learning systems"
    - "on formalizing fairness in prediction with machine learning"
    - "reluplex an efficient smt solver for verifying deep neural networks"
    - "synthesizing robust adversarial examples"
    - "deeptest automated testing of deep neural network driven autonomous cars"

Connected through hyperedge HE-2 (induced by source paper "whither programs as specifications"):
  with members:
    - "hypercollecting semantics and its application to static analysis of information flow"
    - "towards patterns for heaps and imperative lambdas"
    - "on the expressive power of kleene algebra with domain"
    - "a temporal logic for hyperproperties"

Connected through hyperedge HE-3 (induced by source paper "hyperpctl a temporal logic for probabilistic hyperproperties"):
  with members:
    - "a temporal logic for hyperproperties"

Connected through hyperedge HE-4 (induced by source paper "calculational design of information flow monitors extended version"):
  with members:
    - "galois transformers and modular abstract interpreters reusable metatheory for program analysis"
    - "generalizing permissive upgrade in dynamic information flow analysis"
    - "a survey on product operators in abstract interpretation"
    - "attacker control and impact for confidentiality and integrity"

Connected through hyperedge HE-5 (induced by source paper "a cut principle for information flow"):
  with members:
    - "using architecture to reason about information security"
    - "making random choices invisible to the scheduler"

Connected through hyperedge HE-6 (induced by source paper "the anatomy and facets of dynamic policies"):
  with members:
    - "very static enforcement of dynamic policies"

Connected through hyperedge HE-7 (induced by source paper "a semantic hierarchy for erasure policies"):
  with members:
    - "a user model for information erasure"

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)