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: "assessing security and performances of consensus algorithms for permissioned blockchains"
  Abstract: Blockchain is a novel technology that is rising a lot of interest in the industrial and re- search sectors because its properties of decentralisation, immutability and data integrity. Initially, the underlying consensus mechanism has been designed for permissionless block- chain on trustless network model through the proof-of-work, i.e. a mathematical challenge which requires high computational power. This solution suffers of poor performances, hence alternative consensus algorithms as the proof-of-stake have been proposed. Conversely, for permissioned blockchain, where participants are known and authenti- cated, variants of distributed consensus algorithms have been employed. However, most of them comes out without formal expression of security analysis and trust assumptions because the absence of an established knowledge. Therefore the lack of adequate analysis on these algorithms hinders any cautious evaluation of their effectiveness in a real-world setting where systems are deployed over trustless networks, i.e. Internet ...

Connected through hyperedge HE-1 (induced by source paper "secure and transparent audit logs with blockaudit"):
  with members:
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "towards blockchain driven secure and transparent audit logs"
    - "merging supply chain and blockchain technologies"
    - "e voting with blockchain an e voting protocol with decentralisation and voter privacy"
    - "consensus in the age of blockchains"
    - "hijacking bitcoin routing attacks on cryptocurrencies"
    - "centrally banked cryptocurrencies"

Connected through hyperedge HE-2 (induced by source paper "the merits of using ethereum mainnet as a coordination blockchain for ethereum private sidechains"):
  with members:
    - "atomic crosschain transactions for ethereum private sidechains"
    - "selfish mining in ethereum"
    - "anonymous state pinning for private blockchains"
    - "decentralization in bitcoin and ethereum networks"
    - "hyperledger fabric a distributed operating system for permissioned blockchains"
    - "requirements for ethereum private sidechains"
    - "on the longest chain rule and programmed self destruction of crypto currencies"

Connected through hyperedge HE-3 (induced by source paper "vmv augmenting an internet voting system with selene verifiability"):
  with members:
    - "transparent voting platform based on permissioned blockchain"
    - "transaction propagation on permissionless blockchains incentive and routing mechanisms"
    - "design of distributed voting systems"

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)