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: "tls in the wild an internet wide analysis of tls based protocols for electronic communication"
  Abstract: The majority of electronic communication today happens either via email or chat. Thanks to the use of standardised protocols electronic mail (SMTP, IMAP, POP3) and instant chat (XMPP, IRC) servers can be deployed in a decentralised but interoperable fashion. These protocols can be secured by providing encryption with the use of TLS---directly or via the STARTTLS extension---and leverage X.509 PKIs or ad hoc methods to authenticate communication peers. However, many combination of these mechanisms lead to insecure deployments. #R##N#We present the largest study to date that investigates the security of the email and chat infrastructures. We used active Internet-wide scans to determine the amount of secure service deployments, and passive monitoring to investigate if user agents actually use this opportunity to secure their communications. We addressed both the client-to-server interactions as well as server-to-server forwarding mechanisms that these protocols offer, and the use of encryption and authentication methods in the process. #R##N#Our findings shed light on an insofar unexplored area of the Internet. The truly frightening result is that most of our communication is poorly secured in transit.

Connected through hyperedge HE-1 (induced by source paper "privacyscore improving privacy and security via crowd sourced benchmarks of websites"):
  with members:
    - "privacyscore analyse von webseiten auf sicherheits und privatheitsprobleme konzept und rechtliche zulassigkeit"
    - "thou shalt not depend on me analysing the use of outdated javascript libraries on the web"
    - "no need for black chambers testing tls in the e mail ecosystem at large"

Connected through hyperedge HE-2 (induced by source paper "heap reliable assessment of bgp hijacking attacks"):
  with members:
    - "the abandoned side of the internet hijacking internet resources when domain names expire"

Connected through hyperedge HE-3 (induced by source paper "trustbase an architecture to repair and strengthen certificate based authentication"):
  with members:
    - "danger is my middle name experimenting with ssl vulnerabilities in android apps"

Connected through hyperedge HE-4 (induced by source paper "messageguard retrofitting the web with user to user encryption"):
  with members:
    - "we re on the same page a usability study of secure email using pairs of novice users"
    - "private webmail 2 0 simple and easy to use secure email"
    - "why johnny still still can t encrypt evaluating the usability of a modern pgp client"
    - "johnny and jane analyzing secure email using two novice users"

Connected through hyperedge HE-5 (induced by source paper "private webmail 2 0 simple and easy to use secure email"):
  with members:
    - "we re on the same page a usability study of secure email using pairs of novice users"
    - "why johnny still still can t encrypt evaluating the usability of a modern pgp client"

Connected through hyperedge HE-6 (induced by source paper "messageguard a browser based platform for usable content based encryption research"):
  with members:
    - "we re on the same page a usability study of secure email using pairs of novice users"

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)