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 cryptographic approach for steganography"):
  Abstract: In this research work, security concepts are formalized in steganography, and the common paradigms based on information theory are replaced by another ones inspired from cryptography, more practicable are closer than what is usually done in other cryptographic domains. These preliminaries lead to a first proof of a cryptographically secure information hiding scheme.

Includes members:
  Member "a new chaos based watermarking algorithm":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "an optimization technique on pseudorandom generators based on chaotic iterations")
  Member "lyapunov exponent evaluation of a digital watermarking scheme proven to be secure":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "topological study and lyapunov exponent of a secure steganographic scheme")
  Member "steganography a class of algorithms having secure properties":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "lyapunov exponent evaluation of a digital watermarking scheme proven to be secure")
  Member "chaotic iterations versus spread spectrum chaos and stego security":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "low cost monitoring and intruders detection using wireless video sensor networks")

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)