human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "when human cognitive modeling meets pins user independent inter keystroke timing attacks"):
  Abstract: Abstract   This paper proposes the first user-independent inter-keystroke timing attacks on PINs. Our attack method is based on an inter-keystroke timing dictionary built from a human cognitive model whose parameters can be determined by a small amount of training data on any users (not necessarily the target victims). Our attacks can thus be potentially launched on a large scale in real-world settings. We investigate inter-keystroke timing attacks in different online attack settings and evaluate their performance on PINs at different strength levels. Our experimental results show that the proposed attack performs significantly better than random guessing attacks. We further demonstrate that our attacks pose a serious threat to real-world applications and propose various ways to mitigate the threat.

Includes members:
  Member "loophole timing attacks on shared event loops in chrome":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "revisiting and evaluating software side channel vulnerabilities and countermeasures in cryptographic applications")
  Member "flush flush a fast and stealthy cache attack":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "copycat controlled instruction level attacks on enclaves for maximal key extraction")
  Member "flush flush a fast and stealthy cache attack":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "copycat controlled instruction level attacks on enclaves for maximal key extraction")
  Member "armageddon cache attacks on mobile devices":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "nowhere to hide cross modal identity leakage between biometrics and devices")
  Member "drama exploiting dram addressing for cross cpu attacks":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "are we susceptible to rowhammer an end to end methodology for cloud providers")
  Member "pin skimming exploiting the ambient light sensor in mobile devices":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "a report on personally identifiable sensor data from smartphone devices")

Question: Please tell me which class the source paper 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)