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: "analysing the security of google s implementation of openid connect"
  Abstract: Many millions of users routinely use their Google accounts to log in to relying party (RP) websites supporting the Google OpenID Connect service. OpenID Connect, a newly standardised single-sign-on protocol, builds an identity layer on top of the OAuth 2.0 protocol, which has itself been widely adopted to support identity management services. It adds identity management functionality to the OAuth 2.0 system and allows an RP to obtain assurances regarding the authenticity of an end user. A number of authors have analysed the security of the OAuth 2.0 protocol, but whether OpenID Connect is secure in practice remains an open question. We report on a large-scale practical study of Google's implementation of OpenID Connect, involving forensic examination of 103 RP websites which support its use for sign-in. Our study reveals serious vulnerabilities of a number of types, all of which allow an attacker to log in to an RP website as a victim user. Further examination suggests that these vulnerabilities are caused by a combination of Google's design of its OpenID Connect service and RP developers making design decisions which sacrifice security for simplicity of implementation. We also give practical recommendations for both RPs and OPs to help improve the security of real world OpenID Connect systems.

Connected through hyperedge HE-1 (induced by source paper "oauthguard protecting user security and privacy with oauth 2 0 and openid connect"):
  with members:
    - "wpse fortifying web protocols via browser side security monitoring"
    - "the web sso standard openid connect in depth formal security analysis and security guidelines"
    - "a comprehensive formal security analysis of oauth 2 0"

Connected through hyperedge HE-2 (induced by source paper "an extensive formal security analysis of the openid financial grade api"):
  with members:
    - "the web sso standard openid connect in depth formal security analysis and security guidelines"
    - "a comprehensive formal security analysis of oauth 2 0"
    - "analyzing the browserid sso system with primary identity providers using an expressive model of the web"

Connected through hyperedge HE-3 (induced by source paper "wpse fortifying web protocols via browser side security monitoring"):
  with members:
    - "spresso a secure privacy respecting single sign on system for the web"
    - "information flow control in webkit s javascript bytecode"

Connected through hyperedge HE-4 (induced by source paper "the web sso standard openid connect in depth formal security analysis and security guidelines"):
  with members:
    - "a comprehensive formal security analysis of oauth 2 0"
    - "analyzing the browserid sso system with primary identity providers using an expressive model of the web"

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)