Efficient Searchable Symmetric Encryption Supporting Dynamic Multikeyword Ranked Search

Figure 3

An example of the vectors generation of the node u. (a) Method M₁: u is a leaf node, W is a keyword set for the file which u stores, and is a vector generated by adopting the keyword conversion method mentioned in Section 2.5. (b) Method M₂: u is an internal node, and , , and are the vectors of its children.

(a)

(b)