Table 3.
Efficiency comparison among the schemes and ours
| Schemes | Computation costs |
Communication costs |
Storage costs | |||
|---|---|---|---|---|---|---|
| Setup | Trapdoor | Search | Setup | Search | Cloud server | |
| Shang et al.’s scheme [18] | O(|DB|S) | O((|DB|+F + F ⋅ L)S) | O(|DB|L) | O(|DB|S) | O((|DB|+F + F ⋅ L)S) | O(|DB|S) |
| Wang et al.’s scheme [16] | O(mL) | O(m) | O(mL) | O(mL) | O(mL) | O(mL) |
| SAP-ECKS | O(mL) | O(m) | O(mL) | O(mL) | O(mL) | O(mL) |
| SAP-VECKS | O(mL) | O(m) | O(mL) | O(mL) | O(mL) | O(mL) |
|BD|, m, S, F and L represents the number of documents in the database, the number of distinct keywords in the database, the maximum number of distinct keywords in a document, the number of distinct document labels in the database and the maximum cardinality of a document set of files containing a keyword, respectively.
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