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 "study of encryption and decryption of wave file in image formats"):
  Abstract: This paper describes a novel method of encrypting wave files in popular image formats like JPEG, TIF and PNG along with retrieving them from these image files. MATLAB software is used to perform matrix manipulation to encrypt and decrypt sound files into and from image files. This method is not only a stenographic means but also a data compression technique.

Includes members:
  Member "rism reputation based intrusion detection system for mobile ad hoc networks":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "secure management of logs in internet of things")
  Member "ant colony based routing for mobile ad hoc networks towards improved quality of services":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "multipath routing of fragmented data transfer in a smart grid environment")
  Member "steganography and steganalysis different approaches":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "steganalysis detecting lsb steganographic techniques")
  Member "a new trusted and collaborative agent based approach for ensuring cloud security":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "a security framework for cloud data storage cds based on agent")
  Member "data hiding techniques using prime and natural numbers":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "application of multi factor authentication in internet of things domain")
  Member "a semi distributed reputation based intrusion detection system for mobile adhoc networks":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "secure management of logs in internet of things")
  Member "an lsb data hiding technique using natural number decomposition":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "survey of operating systems for the iot environment")

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)