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 "on vulnerabilities of the security association in the ieee 802 15 6 standard"):
  Abstract: Wireless Body Area Networks (WBAN) support a variety of real-time health monitoring and consumer electronics applications. The latest international standard for WBAN is the IEEE 802.15.6. The security association in this standard includes four elliptic curve-based key agreement protocols that are used for generating a master key. In this paper, we challenge the security of the IEEE 802.15.6 standard by showing vulnerabilities of those four protocols to several attacks. We perform a security analysis on the protocols, and show that they all have security problems, and are vulnerable to different attacks.

Includes members:
  Member "a directly public verifiable signcryption scheme based on elliptic curves":
    also connected through other hyperedges:
      (none)
  Member "an elliptic curve based signcryption scheme with forward secrecy":
    also connected through other hyperedges:
      (none)
  Member "cryptanalysis of an efficient signcryption scheme with forward secrecy based on elliptic curve":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "cryptanalysis of an elliptic curve based signcryption scheme")
  Member "smemail a new protocol for the secure e mail in mobile environments":
    also connected through other hyperedges:
      (none)
  Member "lpki a lightweight public key infrastructure for the mobile environments":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "cryptanalysis of an elliptic curve based signcryption scheme")
  Member "ssms a secure sms messaging protocol for the m payment systems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "application security framework for mobile app development in enterprise setup")

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)