Table 2. Execution time (in second).

Size	Our Method	DES	AES	Classic Hill	Hill [3]
256×256	0,097	0,639	0,568	0,192	0,081
512×512	0,172	7,449	0,354	0,214	0,201
1024×1024	0,201	29,112	1,152	0,921	0,852