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 "steganography in modern smartphones and mitigation techniques"):
  Abstract: By offering sophisticated services and centralizing a huge volume of personal data, modern smartphones changed the way we socialize, entertain and work. To this aim, they rely upon complex hardware/software frameworks leading to a number of vulnerabilities, attacks and hazards to profile individuals or gather sensitive information. However, the majority of works evaluating the security degree of smartphones neglects steganography, which can be mainly used to: i) exfiltrate confidential data via camouflage methods, and ii) conceal valuable or personal information into innocent looking carriers. #R##N#Therefore, this paper surveys the state of the art of steganographic techniques for smartphones, with emphasis on methods developed over the period 2005 to the second quarter of 2014. The different approaches are grouped according to the portion of the device used to hide information, leading to three different covert channels, i.e., local, object and network. Also, it reviews the relevant approaches used to detect and mitigate steganographic attacks or threats. Lastly, it showcases the most popular software applications to embed secret data into carriers, as well as possible future directions.

Includes members:
  Member "steganography using the extensible messaging and presence protocol xmpp":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "a pattern based survey and categorization of network covert channel techniques")
  Member "stegtorrent a steganographic method for the p2p file sharing service":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "hidden and uncontrolled on the emergence of network steganographic threats")
  Member "principles and overview of network steganography":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "real time steganalysis for stream media based on multi channel convolutional sliding windows")
  Member "voip steganography and its detection a survey":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "hierarchical representation network for steganalysis of qim steganography in low bit rate speech signals")
  Member "using transcoding for hidden communication in ip telephony":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "movesteg a method of network steganography detection")
  Member "lost audio packets steganography the first practical evaluation":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "fundamental limits of covert packet insertion")
  Member "capacity of steganographic channels":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "approaching maximum embedding efficiency on small covers using staircase generator codes")
  Member "lack a voip steganographic method":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "youskyde information hiding for skype video traffic")

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.MM(Multimedia)