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SCIENTIA SINICA Informationis, Volume 51 , Issue 8 : 1345(2021) https://doi.org/10.1360/SSI-2020-0048

Access control scheme on blockchain and decentralized attributed-based algorithm with identity

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  • ReceivedMar 8, 2020
  • AcceptedJun 17, 2020
  • PublishedJul 29, 2021

Abstract


Funded by

国家重点研发计划(2019YFB2101703)

国家自然科学基金(61672166,U19A2066)

上海科技创新行动计划(20222420800,20511102200)


References

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  • Figure 1

    (Color online) Universal processes

  • Figure 2

    (Color online) Time curve fitting of calculating $\mathrm{OPK}$ with different $t$

  • Table 1   Functional characteristics comparison
    Features Ref. [6] Ref. [8] Our scheme
    Central manager's effect Mastering main secret key and generate private keys for other devices. Combine main public key at System Setup. None. Nodes negotiate the choice of $\mathrm{GP}$ by Blockchain.
    Blockchain's effect Provide consensus mechanism like PBFT. Save encrypted data.
    Public cloud storage's effect Save encrypted data. Save encrypted data.
    Smart contract's effect Save, update, verify the access control policy; save encrypted symmetric keys. Execute business logic; initialize system, organization and authorize attributes.
    Role definition Not obvious, all devices except central manager are users. One certificate authority, many attribute authorities and users. Include organizations and users, which have similar features.
    Users' identity authentication Identities are supported by Blockchain and its consensus mechanism, or divided by business id. Certificate authority is responsible for identity verification. In different domains, users can combine specific identities by authorized attributes.
    Access control on data Smart contract saves and updates the access control policy. ABE controls the access control policy. ABE controls the access control policy.
    Decentralization's supportPBFT and smart contract. Multi-attribute Authorities. User communicates with others by the chain of trust.
    ABE's features Centralized ABE, attributes are confirmed in system setup. Decentralized ABE, attributes are confirmed in system setup. Decentralized ABE, attributes are subsequently generated by organizations or users.
  • Table 2   Calculation cost comparison
    Steps Ref. [6] Ref. [8] Our scheme
    Global setup $E+P$ $E+P+tE_T$ $P$
    User setup $E_T+E$
    Org setup $n(t-2)N+E_T$
    User: $n(t-2)N+E_T$
    Smart contract: $tE_T$
    User generate attributes $E$
    Org generate attributes
    User: $n(t-2)N+E$
    Smart contract: $tE$
    User KeyGen $(3+|S|)E+P$ $E$
    Org KeyGen
    Org's member: $(3+|S|)E$
    Request user: $(2+|S|)tE$
    Org's member: $E$
    Request user: $tE$
    Encryption $E_T~+~(3|C|+1)E$ $E_T~+~(3|C|+1)E$ $E_T+|C|(2E_T+3E)$
    Decryption $P+|S|(2P+E_T)$ $P+|S|(2P+E_T)$ $|S|(2P+E_T)$
  • Table 3   Benchmark operation time reference
    Operation Time (ms)
    $N$ 0.024
    $E_T$ 0.157
    $P$ 1.464
    $E$ 2.019
  • Table 4   Algorithm running time (ms)
    Steps Ref. [8] Our scheme
    Global setup 4.665[$E+P+tE_T$] 3.440[$P$]
    User setup 2.195[$E_T+E$]
    Org setup 2.152[$n(t-2)N+E_T$]
    User: 2.234[$n(t-2)N+E_T$]
    Smart contract: 0.369[$tE_T$]
    User generate attributes 2.032[$E$]
    Org generate attributes
    User: 2.069[$n(t-2)N+E$]
    Smart contract: 4.089[$tE$]
    User KeyGen 2.140[$E$]
    Org KeyGen
    Org's member: 12.492[$(3+|S|)E$]
    Request user: 23.884[$(2+|S|)tE$]
    Org's member: 1.693[$E$]
    Request user: 4.085[$tE$]
    Encryption 14.652[$E_T~+~(3|C|+1)E$] 13.090[$E_T+|C|(2E_T+3E)$]
    Decryption 9.365[$P+|S|(2P+E_T)$] 6.431[$|S|(2P+E_T)$]
  • Table 5   Org initialization's time with different $(t,n)$ (ms)
    $(t,n)$ User generate share User generate ${\rm~opk}_i$ Smart contract calculate $\mathrm{OPK}$
    $(2,3)$ 0.049 2.185 0.369
    $(10,30)$ 0.342 2.162 4.117
    $(20,30)$ 0.657 2.179 13.788
    $(20,60)$ 0.868 2.178 13.778
    $(200,300)$ 22.877 2.218 1151.472
  • Table 6   Encryption and decryption time with different attributes (ms)
    Number of Encryption with Encryption with Decryption with Decryption with
    attributes used all “AND" all “OR" all “AND" all “OR"
    2 13.079 9.071 6.382 6.462
    4 25.838 17.822 12.640 12.618
    8 51.526 35.306 25.248 25.170
    16 102.436 70.267 50.829 50.058
    32 204.648 140.809 99.709 100.947
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