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: "suspicious taint based access control for protecting os from network attacks"
  Abstract: Today, security threats to operating systems largely come from network. Traditional discretionary access control mechanism alone can hardly defeat them. Although traditional mandatory access control models can effectively protect the security of OS, they have problems of being incompatible with application software and complex in administration. In this paper, we propose a new model, Suspicious-Taint-Based Access Control (STBAC) model, for defeating network attacks while being compatible, simple and maintaining good system performance. STBAC regards the processes using Non-Trustable-Communications as the starting points of suspicious taint, traces the activities of the suspiciously tainted processes by taint rules, and forbids the suspiciously tainted processes to illegally access vital resources by protection rules. Even in the cases when some privileged processes are subverted, STBAC can still protect vital resources from being compromised by the intruder. We implemented the model in the Linux kernel and evaluated it through experiments. The evaluation showed that STBAC could protect vital resources effectively without significant impact on compatibility and performance.

Connected through hyperedge HE-1 (induced by source paper "an instrumenting compiler for enforcing confidentiality in low level code"):
  with members:
    - "intel mpx explained an empirical study of intel mpx and software based bounds checking approaches"

Connected through hyperedge HE-2 (induced by source paper "duplication of windows services"):
  with members:
    - "design and implementation of a network security management system"
    - "virtualizing system and ordinary services in windows based os level virtual machines"
    - "a study on altering postgresql from multi processes structure to multi threads structure"
    - "implementing rbac model in an operating system kernel"
    - "compatible and usable mandatory access control for good enough os security"

Connected through hyperedge HE-3 (induced by source paper "design and implementation of a network security management system"):
  with members:
    - "virtualizing system and ordinary services in windows based os level virtual machines"
    - "a study on altering postgresql from multi processes structure to multi threads structure"
    - "implementing rbac model in an operating system kernel"
    - "compatible and usable mandatory access control for good enough os security"

Connected through hyperedge HE-4 (induced by source paper "confining windows inter process communications for os level virtual machine"):
  with members:
    - "design and implementation of a network security management system"
    - "virtualizing system and ordinary services in windows based os level virtual machines"
    - "a study on altering postgresql from multi processes structure to multi threads structure"
    - "implementing rbac model in an operating system kernel"

Connected through hyperedge HE-5 (induced by source paper "virtualizing system and ordinary services in windows based os level virtual machines"):
  with members:
    - "design and implementation of a network security management system"
    - "a study on altering postgresql from multi processes structure to multi threads structure"
    - "implementing rbac model in an operating system kernel"

Connected through hyperedge HE-6 (induced by source paper "a study on altering postgresql from multi processes structure to multi threads structure"):
  with members:
    - "design and implementation of a network security management system"
    - "implementing rbac model in an operating system kernel"
    - "compatible and usable mandatory access control for good enough os security"

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)