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: "stealthdb a scalable encrypted database with full sql query support"
  Abstract: Encrypted database systems provide a great method for protecting sensitive data in untrusted infrastructures. These systems are built using either special-purpose cryptographic algorithms that support operations over encrypted data, or by leveraging trusted computing co-processors. Strong cryptographic algorithms usually result in high performance overheads (e.g., public-key encryptions, garbled circuits), while weaker algorithms (e.g., order-preserving encryption) result in large leakage profiles. On the other hand, some encrypted database systems (e.g., Cipherbase, TrustedDB) leverage non-standard trusted computing devices, and are designed to work around their specific architectural limitations. #R##N#In this work we build StealthDB -- an encrypted database system from Intel SGX. Our system can run on any newer generation Intel CPU. StealthDB has a very small trusted computing base, scales to large datasets, requires no DBMS changes, and provides strong security guarantees at steady state and during query execution.

Connected through hyperedge HE-1 (induced by source paper "encdbdb searchable encrypted fast compressed in memory database using enclaves"):
  with members:
    - "an efficiently searchable encrypted data structure for range queries"
    - "software grand exposure sgx cache attacks are practical"
    - "hardidx practical and secure index with sgx"
    - "zerodb white paper"
    - "oblivious query processing"

Connected through hyperedge HE-2 (induced by source paper "toward scalable fully homomorphic encryption through light trusted computing assistance"):
  with members:
    - "spectre attacks exploiting speculative execution"
    - "cachezoom how sgx amplifies the power of cache attacks"
    - "oblidb oblivious query processing for secure databases"
    - "lightbox full stack protected stateful middlebox at lightning speed"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"
    - "drama exploiting dram addressing for cross cpu attacks"

Connected through hyperedge HE-3 (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"
    - "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"
    - "inferring fine grained control flow inside sgx enclaves with branch shadowing"

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)