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 "a key set cipher for wireless sensor networks"):
  Abstract: This paper proposes the use of sets of keys, together with corresponding identifiers, for use in wireless sensor networks and similar resource-constrained applications. A specific cryptographic scheme described in the paper is based on the use of a family of self-inverting matrices derived from the number theoretic Hilbert transform in conjunction with the Blom's scheme. In a randomized version of this scheme, the users change their published IDs at will but the parties can still reach agreement on the key by using individual scaling factors. The random protocol increases the security of the system.

Includes members:
  Member "random residue sequences and the number theoretic hilbert transform":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "a new result on the random residue sequence algorithm")
  Member "new results on the number theoretic hilbert transform":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "a new result on the random residue sequence algorithm")
  Member "a class of orthogonal sequences":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "a new result on the random residue sequence algorithm")
  Member "the 10 point and 12 point number theoretic hilbert transform":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "a new result on the random residue sequence algorithm")
  Member "the number theoretic hilbert transform":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "a new result on the random residue sequence algorithm")
  Member "the basic discrete hilbert transform with an information hiding application":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "random residue sequences and the number theoretic hilbert transform")

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)