A Cloud-User Protocol Based on Ciphertext Watermarking Technology

Algorithm 3

Generating .

Input:

Output:

  n length of W;

  ;

  embedding positions random sequence

from[1,2,...step] of length

  for    to    do

  for    to  step  do

  if    then

   Break;

  end

  else

  if   is in embedding positions  then

  if    then

  end

  else

  end

  end

  else

   is equal to

  end

  end

  end

  end

  return