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Multi-authority attribute-based encryption (MA-ABE) schemes serve as a promising core technology for secure data access control in multi-organizational cross-domain collaboration scenarios. However, the dynamic nature of such scenarios may cause adaptive leakage risks of authorities and require the periodic update of partial user attributes and secret keys. To address the above problems and challenges, this paper proposes a fully adaptive secure access control scheme supporting attribute revocation. While guaranteeing full adaptive security, the scheme designs dedicated revocation parameters and adopts an efficient user key update algorithm to realize flexible and efficient multi-authority attribute revocation. To guarantee forward and backward security, this paper constructs a ciphertext update component and proposes a lightweight ciphertext update mechanism, which only requires one pairing operation and one multiplication operation. Rigorous security proofs demonstrate that the proposed scheme satisfies full adaptive security. Theoretical analysis and experimental comparisons are performed for performance evaluation. The results show that the scheme achieves high efficiency in the attribute revocation phase. Specifically, the computational cost of key revocation is only 25% of that of comparable schemes, and the ciphertext update computational cost is at a constant level.
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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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