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 model for android and ios applications risk calculation cvss analysis and enhancement using case control studies"):
  Abstract: Various researchers have shown that the Common Vulnerability Scoring System (CVSS) has many drawbacks and may not provide a precise view of the risks related to software vulnerabilities. However, many threat intelligence platforms and industry-wide standards are relying on CVSS score to evaluate cyber security compliance. This paper suggests several improvements to the calculation of Impact and Exploitability sub-scores within the CVSS, improve its accuracy and help threat intelligence analysts to focus on the key risks associated with their assets. We will apply our suggested improvements against risks associated with several Android and iOS applications and discuss achieved improvements and advantages of our modelling, such as the importance and the impact of time on the overall CVSS score calculation.

Includes members:
  Member "greening cloud enabled big data storage forensics syncany as a case study":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "cloudme forensics a case of big data forensic investigation")
  Member "internet of things security and forensics challenges and opportunities":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "architectural software patterns for the development of iot smart applications")
  Member "mobile phone forensics an investigative framework based on user impulsivity and secure collaboration errors":
    also connected through other hyperedges:
      (none)
  Member "a cyber kill chain based taxonomy of banking trojans for evolutionary computational intelligence":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "a blockchain based framework for detecting malicious mobile applications in app stores")
  Member "forensics analysis of android mobile voip apps":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "a blockchain based framework for detecting malicious mobile applications in app stores")
  Member "an android cloud storage apps forensic taxonomy":
    also connected through other hyperedges:
      (none)
  Member "know abnormal find evil frequent pattern mining for ransomware threat hunting and intelligence":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "a blockchain based framework for detecting malicious mobile applications in app stores")
  Member "forensic investigation of social media and instant messaging services in firefox os facebook twitter google telegram openwapp and line as case studies":
    also connected through other hyperedges:
      (none)

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)