Service-Based Hybrid Access Control Technology with Priority Level for the Internet of Vehicles under the Cloud Architecture

Table 6

Comparison of access control models. (✓ indicates that it has the function, ✗ means not having).

Scheme	Cr1	Cr2-	Cr3	Cr4	Cr5	Cr6	Cr7	Cr8	Cr9	Cr10	Cr11
Ref. [20]	Low	Medium	Low	✓	✓	✗	✗	✗	✗	✗	✓
Ref. [26]	High	Medium	High	✗	✓	✗	✗	✗	✗	✗	✓
Ref. [30]	High	Low	High	✗	✓	✓	✗	✗	✗	✓	✓
Ref. [31]	High	Medium	Medium	✗	✓	✓	✗	✗	✗	✗	✗
Ref. [32]	High	Medium	High	✗	✓	✓	✗	✗	✗	✓	✓
Ref. [33]	Medium	✗	Based on attribute combination	✗	✓	✗	✗	✗	✗	✗	✗
Ref. [39]	High	Medium	High	✗	✓	✓	✓	✗	✗	✗	✓
Our scheme	High	Medium	Medium	✗	✓	✓	✓	✓	✓	✓	✓

^∗Cr-Criterion; Cr₁- Scalability; Cr₂- Context awareness; Cr₃- Granular; Cr₄- Delegation support; Cr₅- Dynamic; Cr₆-hierarchies; Cr₇- Priority mechanism; Cr₈- Adjustable permissions; Cr₉- Permission reservation; Cr₁₀- Permission inheritance mechanism; Cr₁₁- Access control model practical running experiments.