Reversible Fragile Watermarking Scheme for Relational Database Based on Prediction-Error Expansion

Algorithm 3

Encode_Bit

(1)	lsd = GetLSD (ti.Aj)
(2)	T = GetMSD (ti.Aj) //Most significant digits of ti.Aj
(3)	e = lsd−hi //Prediction error
(4)	= 2∗e + Wj[i] //expanded prediction error
(5)	newval =  + hi //New value of the LSD
(6)	newval = To_number (T, newval)
(7)	//Update the watermarked attribute value
(8)	ti·Aj = newval