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: "an lsb data hiding technique using prime numbers"
  Abstract: In this paper, a novel data hiding technique is proposed, as an improvement over the Fibonacci LSB data-hiding technique proposed by Battisti et al. First we mathematically model and generalize our approach. Then we propose our novel technique, based on decomposition of a number (pixel-value) in sum of prime numbers. The particular representation generates a different set of (virtual) bit-planes altogether, suitable for embedding purposes. They not only allow one to embed secret message in higher bit-planes but also do it without much distortion, with a much better stego-image quality, and in a reliable and secured manner, guaranteeing efficient retrieval of secret message. A comparative performance study between the classical Least Significant Bit (LSB)method, the Fibonacci LSB data-hiding technique and our proposed schemes has been done. Analysis indicates that image quality of the stego-image hidden by the technique using Fibonacci decomposition improves against that using simple LSB substitution method, while the same using the prime decomposition method improves drastically against that using Fibonacci decomposition technique. Experimental results show that, the stego-image is visually indistinguishable from the original cover-image.

Connected through hyperedge HE-1 (induced by source paper "steganalysis detecting lsb steganographic techniques"):
  with members:
    - "reversible and irreversible data hiding technique"
    - "a survey on various data hiding techniques and their comparative analysis"
    - "steganography and steganalysis different approaches"
    - "data hiding techniques using prime and natural numbers"
    - "an lsb data hiding technique using natural number decomposition"

Connected through hyperedge HE-2 (induced by source paper "reversible and irreversible data hiding technique"):
  with members:
    - "hiding inside html and other source codes"
    - "an lsb data hiding technique using natural number decomposition"

Connected through hyperedge HE-3 (induced by source paper "a survey on security issues in ad hoc routing protocols and their mitigation techniques"):
  with members:
    - "rism reputation based intrusion detection system for mobile ad hoc networks"
    - "a multi factor security protocol for wireless payment secure web authentication using mobile devices"
    - "automatic firewall rules generator for anomaly detection systems with apriori algorithm"
    - "a semi distributed reputation based intrusion detection system for mobile adhoc networks"
    - "a distributed trust and reputation framework for mobile ad hoc networks"

Connected through hyperedge HE-4 (induced by source paper "classification of various security techniques in databases and their comparative analysis"):
  with members:
    - "steganography and steganalysis different approaches"
    - "data hiding techniques using prime and natural numbers"
    - "a security protocol for multi user authentication"
    - "an lsb data hiding technique using natural number decomposition"

Connected through hyperedge HE-5 (induced by source paper "a hybrid approach towards intrusion detection based on artificial immune system and soft computing"):
  with members:
    - "detection and prevention of botnets and malware in an enterprise network"
    - "steganography and steganalysis different approaches"
    - "a multi factor security protocol for wireless payment secure web authentication using mobile devices"
    - "a semi distributed reputation based intrusion detection system for mobile adhoc networks"

Connected through hyperedge HE-6 (induced by source paper "a survey on various data hiding techniques and their comparative analysis"):
  with members:
    - "steganography and steganalysis different approaches"
    - "steganography of voip streams"

Connected through hyperedge HE-7 (induced by source paper "a paxos based state machine replication system for anomaly detection"):
  with members:
    - "steganography and steganalysis different approaches"
    - "an lsb data hiding technique using natural number decomposition"

Connected through hyperedge HE-8 (induced by source paper "collusion resistant self healing key distribution in mobile wireless networks"):
  with members:
    - "a multi factor security protocol for wireless payment secure web authentication using mobile devices"
    - "a novel multipath approach to security in mobile ad hoc networks manets"

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.CR(Cryptography and Security)