A Hybrid Digital-Signature and Zero-Watermarking Approach for Authentication and Protection of Sensitive Electronic Documents

Table 1

Computational-cost comparison between relevant approaches.

File name	No. of Chars	Computational time encoder (ms)						Computational time decoder (ms)
		(Tayan et al., [33])	(Jalil et al., [34])	(Meng et al., [35])	Method A from [36]	Method B from [36]	Proposed approach	(Tayan et al., [33])	(Jalil et al., [34])	(Meng et al., [35])	Method A from [36]	Method B from [36]	Proposed approach
Text 1	28915	30	180	210	20	40	20	20	170	224	10	20	20
Text 2	47974	40	160	350	30	60	40	30	240	371	20	40	40
Text 3	54839	60	195	410	50	100	60	40	278	460	40	40	70
Text 4	116794	80	1714	1850	70	190	100	70	1684	1891	60	80	110
Text 5	166166	130	590	620	120	300	160	100	520	640	100	130	170
Ave./char		0.00089	0.0063	0.0083	0.00071	0.0016	0.00089	0.00065	0.0067	0.0088	0.00052	0.00074	0.00095