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: "packet chasing spying on network packets over a cache side channel"
  Abstract: This paper presents Packet Chasing, an attack on the network that does not require access to the network, which works regardless of the privilege level of the process receiving the packets. A spy process can easily probe and discover the exact cache location of each buffer used by the network driver. Even more useful, it can discover the exact sequence in which those buffers are used to receive packets. This then enables packet frequency and packet sizes to be monitored through existing cache side channels. This enables both covert channels between a sender and a remote spy with no access to the network, as well as direct attacks that can identify the web page access patterns of a victim on the network.

Connected through hyperedge HE-1 (induced by source paper "jackhammer efficient rowhammer on heterogeneous fpga cpu platforms"):
  with members:
    - "fortuneteller predicting microarchitectural attacks via unsupervised deep learning"
    - "theory and practice of finding eviction sets"
    - "another flip in the wall of rowhammer defenses"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "perfweb how to violate web privacy with hardware performance events"
    - "autolock why cache attacks on arm are harder than you think"
    - "a software approach to defeating side channels in last level caches"
    - "flush flush a fast and stealthy cache attack"

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)