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: "privacy preserving shortest path computation"
  Abstract: Navigation is one of the most popular cloud computing services. But in virtually all cloud-based navigation systems, the client must reveal her location and destination to the cloud service provider in order to learn the fastest route. In this work, we present a cryptographic protocol for navigation on city streets that provides privacy for both the client’s location and the service provider’s routing data. Our key ingredient is a novel method for compressing the next-hop routing matrices in networks such as city street maps. Applying our compression method to the map of Los Angeles, for example, we achieve over tenfold reduction in the representation size. In conjunction with other cryptographic techniques, this compressed representation results in an ecient protocol suitable for fully-private real-time navigation on city streets. We demonstrate the practicality of our protocol by benchmarking it on real street map data for major cities such as San Francisco and Washington, D.C.

Connected through hyperedge HE-1 (induced by source paper "throughput optimal routing in blockchain based payment systems"):
  with members:
    - "atomic cross chain swaps"
    - "high throughput cryptocurrency routing in payment channel networks"
    - "settling payments fast and private efficient decentralized routing for path based transactions"
    - "pricing and optimization in shared vehicle systems an approximation framework"
    - "online advertisement optimization and stochastic networks"

Connected through hyperedge HE-2 (induced by source paper "a hybrid approach to secure function evaluation using sgx"):
  with members:
    - "spectre attacks exploiting speculative execution"
    - "microwalk a framework for finding side channels in binaries"
    - "software grand exposure sgx cache attacks are practical"
    - "securing application with software partitioning a case study using sgx"
    - "malware guard extension using sgx to conceal cache attacks"

Connected through hyperedge HE-3 (induced by source paper "graphse an encrypted graph database for privacy preserving social search"):
  with members:
    - "nxgraph an efficient graph processing system on a single machine"
    - "cryptgraph privacy preserving graph analytics on encrypted graph"
    - "empirical analysis of predictive algorithms for collaborative filtering"
    - "distributed graphlab a framework for machine learning in the cloud"
    - "efficient authenticated data structures for graph connectivity and geometric search problems"

Connected through hyperedge HE-4 (induced by source paper "a privacy preserving traffic monitoring scheme via vehicular crowdsourcing"):
  with members:
    - "prif a privacy preserving interest based forwarding scheme for social internet of vehicles"
    - "lptd achieving lightweight and privacy preserving truth discovery in ciot"

Connected through hyperedge HE-5 (induced by source paper "oblidb oblivious query processing for secure databases"):
  with members:
    - "sgxpectre stealing intel secrets from sgx enclaves via speculative execution"
    - "obladi oblivious serializable transactions in the cloud"
    - "the pyramid scheme oblivious ram for trusted processors"
    - "stealthdb a scalable encrypted database with full sql query support"
    - "software grand exposure sgx cache attacks are practical"
    - "prochlo strong privacy for analytics in the crowd"
    - "sok cryptographically protected database search"
    - "hardidx practical and secure index with sgx"

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)