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: "achievable rates for the general gaussian multiple access wire tap channel with collective secrecy"
  Abstract: We consider the General Gaussian Multiple Access Wire-Tap Channel (GGMAC-WT). In this scenario, multiple users communicate with an intended receiver in the presence of an intelligent and informed eavesdropper who is as capable as the intended receiver, but has different channel parameters. We aim to provide perfect secrecy for the transmitters in this multi-access environment. Using Gaussian codebooks, an achievable secrecy region is determined and the power allocation that maximizes the achievable sum-rate is found. Numerical results showing the new rate region are presented. It is shown that the multiple-access nature of the channel may be utilized to allow users with zero single-user secrecy capacity to be able to transmit in perfect secrecy. In addition, a new collaborative scheme is shown that may increase the achievable sum-rate. In this scheme, a user who would not transmit to maximize the sum rate can help another user who (i) has positive secrecy capacity to increase its rate, or (ii) has zero secrecy capacity to achieve a positive secrecy capacity.

Connected through hyperedge HE-1 (induced by source paper "on the secure degrees of freedom of the k user mac and 2 user interference channels"):
  with members:
    - "on the secure degrees of freedom of the multiple access channel"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "secrecy in cooperative relay broadcast channels"

Connected through hyperedge HE-2 (induced by source paper "secure degrees of freedom for the mimo wire tap channel with a multi antenna cooperative jammer"):
  with members:
    - "secure degrees of freedom of one hop wireless networks with no eavesdropper csit"
    - "secure degrees of freedom regions of multiple access and interference channels the polytope structure"
    - "secure degrees of freedom of one hop wireless networks"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "secure degrees of freedom of k user gaussian interference channels a unified view"
    - "interference assisted secret communication"
    - "strong secrecy from channel resolvability"
    - "cooperation with an untrusted relay a secrecy perspective"

Connected through hyperedge HE-3 (induced by source paper "secure degrees of freedom of the gaussian mimo wiretap and mimo broadcast channels with unknown eavesdroppers"):
  with members:
    - "mimo broadcast channel with an unknown eavesdropper secrecy degrees of freedom"
    - "secure degrees of freedom of the gaussian wiretap channel with helpers and no eavesdropper csi blind cooperative jamming"
    - "mimo wiretap channels with arbitrarily varying eavesdropper channel states"
    - "on the secure degrees of freedom of the multiple access channel"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "secrecy in cooperative relay broadcast channels"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-4 (induced by source paper "secure degrees of freedom of the mimo multiple access channel with multiple unknown eavesdroppers"):
  with members:
    - "mimo wiretap channels with arbitrarily varying eavesdropper channel states"
    - "on the secure degrees of freedom of the multiple access channel"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "secrecy in cooperative relay broadcast channels"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-5 (induced by source paper "on the degrees of freedom of mimo multiple access channel with multiple eavesdroppers"):
  with members:
    - "mimo wiretap channels with arbitrarily varying eavesdropper channel states"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "secrecy in cooperative relay broadcast channels"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-6 (induced by source paper "waveform design for secure siso transmissions and multicasting"):
  with members:
    - "robust beamforming for security in mimo wiretap channels with imperfect csi"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "on the relationship between the multi antenna secrecy communications and cognitive radio communications"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "the secrecy capacity of the mimo wiretap channel"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-7 (induced by source paper "joint relay and jammer selection for secure two way relay networks"):
  with members:
    - "differential modulation for bi directional relaying with analog network coding"
    - "cooperative secret communication with artificial noise in symmetric interference channel"
    - "the role of feedback in two way secure communications"
    - "secrecy in cooperative relay broadcast channels"
    - "achievable rates for two way wire tap channels"
    - "the relay eavesdropper channel cooperation for secrecy"

Connected through hyperedge HE-8 (induced by source paper "cooperation with an untrusted relay a secrecy perspective"):
  with members:
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "providing secrecy with structured codes tools and applications to two user gaussian channels"
    - "the role of feedback in two way secure communications"
    - "providing secrecy with lattice codes"
    - "two hop secure communication using an untrusted relay"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "multi antenna gaussian broadcast channels with confidential messages"

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.IT(Information Theory)