Efficient Two-Step Protocol and Its Discriminative Feature Selections in Secure Similar Document Detection

Algorithm 4

Modification of Line of SSDD-FS to implement SSDD-LF.

(1-1) and are -dimensional document vectors.

(1-2) Alice chooses dimensions, (), whose TFs are larger than other dimensions.

(1-3) Alice sends those indexes to Bob. // This can be done together with Line of Algorithm 1

(1-4) and are -dimensional feature vectors extracted from and by using those

   indexes. // , , .