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In response to the privacy leakage issues in the data sharing process among the fleet vehicles in Vehicular Social Network (VSN), this paper proposed a ciphertext policy attribute-based encryption scheme. Firstly, utilizing attribute-based encryption techniques, the scheme ensures that only authorized vehicles can access the data, thereby preventing privacy leakage during the fleet vehicle data sharing process. To address the issue of high time complexity in generating access policies during fleet vehicle data sharing, and low data sharing efficiency, an access tree was constructed to design the access policies. The access tree was then transformed into an access matrix using roadside units, enabling fast generation of access policies. Experimental analysis shows that this scheme achieves secure data sharing among fleet vehicles in VSNs, the proposed access policy generation approach effectively reduces the computational overhead for vehicles.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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