An Efficient Online Multiparty Interactive Medical Prediagnosis Scheme with Privacy Protection

Algorithm 2

Preprocessing for medical instances.

Input: disease , medical vector (or ), feature weight

vector .

Output: the preprocessed vector , (or ).

1: Generate two large prime numbers and a random number (or ) and satisfy ,

and (or );

2: The feature weight is assigned to get ,

(or );

3: The vector value is iteratively transformed to get

,

(or );

4: The vector is expanded forward to get

,

(or );

5:for to do

6: Generate a random number (or ) and satisfy ;

7: if do

8:   (or );

9: else do

10:   (or );

11: end if

12:end for

13: return (or ).