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: "riposte an anonymous messaging system handling millions of users"
  Abstract: This paper presents Riposte, a new system for anonymous broadcast messaging. Riposte is the first such system, to our knowledge, that simultaneously protects against traffic-analysis attacks, prevents anonymous denial-of-service by malicious clients, and scales to million-user anonymity sets. To achieve these properties, Riposte makes novel use of techniques used in systems for private information retrieval and secure multi-party computation. For latency-tolerant workloads with many more readers than writers (e.g. Twitter, Wikileaks), we demonstrate that a three-server Riposte cluster can build an anonymity set of 2,895,216 users in 32 hours.

Connected through hyperedge HE-1 (induced by source paper "prifi low latency anonymity for organizational networks"):
  with members:
    - "taranet traffic analysis resistant anonymity at the network layer"
    - "i know what you saw last minute encrypted http adaptive video streaming title classification"
    - "the loopix anonymity system"
    - "atom horizontally scaling strong anonymity"
    - "device fingerprinting in wireless networks challenges and opportunities"
    - "hornet high speed onion routing at the network layer"
    - "dovetail stronger anonymity in next generation internet routing"
    - "hang with your buddies to resist intersection attacks"

Connected through hyperedge HE-2 (induced by source paper "talek private group messaging with hidden access patterns"):
  with members:
    - "xrd scalable messaging system with cryptographic privacy"
    - "the loopix anonymity system"
    - "atom horizontally scaling strong anonymity"
    - "rappor randomized aggregatable privacy preserving ordinal response"
    - "proactively accountable anonymous messaging in verdict"

Connected through hyperedge HE-3 (induced by source paper "dynamically protecting privacy under uncertainty"):
  with members:
    - "query complexity of bayesian private learning"
    - "private sequential learning"
    - "quantifying surveillance in the networked age node based intrusions and group privacy"
    - "perception games and privacy"
    - "spy vs spy rumor source obfuscation"
    - "the empirical implications of privacy aware choice"
    - "privacy preserving public information for sequential games"
    - "robust adaptive routing under uncertainty"

Connected through hyperedge HE-4 (induced by source paper "sgx lkl securing the host os interface for trusted execution"):
  with members:
    - "keystone an open framework for architecting tees"
    - "dr sgx automated and adjustable side channel protection for sgx using data location randomization"
    - "zombieload cross privilege boundary data sampling"
    - "interface based side channel attack against intel sgx"
    - "obladi oblivious serializable transactions in the cloud"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "oblidb oblivious query processing for secure databases"
    - "software grand exposure sgx cache attacks are practical"

Connected through hyperedge HE-5 (induced by source paper "on the complexity of anonymous communication through public networks"):
  with members:
    - "tempest temporal dynamics in anonymity systems"
    - "practical and provably secure onion routing"
    - "atom horizontally scaling strong anonymity"
    - "raptor routing attacks on privacy in tor"
    - "the melbourne shuffle improving oblivious storage in the cloud"
    - "calibrating data to sensitivity in private data analysis"
    - "probabilistic analysis of onion routing in a black box model"

Connected through hyperedge HE-6 (induced by source paper "express lowering the cost of metadata hiding communication with cryptographic privacy"):
  with members:
    - "xrd scalable messaging system with cryptographic privacy"
    - "prio private robust and scalable computation of aggregate statistics"
    - "the loopix anonymity system"
    - "atom horizontally scaling strong anonymity"
    - "conscript your friends into larger anonymity sets with javascript"
    - "proactively accountable anonymous messaging in verdict"

Connected through hyperedge HE-7 (induced by source paper "jedi many to many end to end encryption and key delegation for iot"):
  with members:
    - "droplet decentralized authorization for iot data streams"
    - "nucypher kms decentralized key management system"
    - "distributed authorization in vanadium"
    - "privacy discovery and authentication for the internet of things"
    - "cryptographic enforcement of information flow policies without public information"

Connected through hyperedge HE-8 (induced by source paper "xrd scalable messaging system with cryptographic privacy"):
  with members:
    - "the loopix anonymity system"
    - "atom horizontally scaling strong anonymity"

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)