Distortion-Free Watermarking Approach for Relational Database Integrity Checking

Algorithm 4

Integrity checking.

Input: Suspicious database  , Secret key K,

   number of groups    and

Output: Verification report

   (1) Begin

  (2) extract   from  

  (3) compute

  (4) database partitioning into groups // see Algorithm 1

  (5) for to do

  (6) compute    // th  suspicious group watermark

  (7) if   then  // watermarks comparison

  (8)  return non-altered group

  (9) else

(10)     return altered group

 (11) end if

(12) end for

(13) end