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Searchable encryption is a key technology for enabling data encrypted search, and it has significant application value for cloud storage. However, existing schemes generally adopt a single-user model and are vulnerable to insider keyword guessing attacks, which exposes cloud data to the risk of privacy leakage. Therefore, there is an urgent need to design a searchable encryption scheme that support multi-user models and provide higher security to meet the privacy-preserving of cloud data. In response, this paper proposes an authenticated ciphertext retrieval scheme for cloud data access control. In terms of access control, the scheme embeds attributes into users' secret key to generate search trapdoor and incorporates access policies into the keyword ciphertext. The matching of attributes and access policies is achieved through threshold secret sharing techniques, thus establishing a fine-grained retrieval permission control mechanism. To enhance security, the secret key of the data owner is embedded into the keyword ciphertext to provide ciphertext authentication, effectively preventing insider keyword guessing attacks. Performance analysis shows that the trapdoor generation algorithm in our proposed scheme are computationally efficient, while the user secret key has relatively low storage overhead, making our scheme suitable for cloud storage applications.
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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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