Cryptanalysis and Improvement of an Efficient and Secure Medical Image Protection Scheme

Table 5

Encryption time of the comparable cryptosystems.

Image size	Gray scale	File size	Original scheme (ms)	DES (ms)	Improved scheme (ms)
256 × 256	8-bit	64 K	18.8	51.2	12.6
256 × 256	16-bit	128 K	34.4	86.7	23.2
512 × 512	8-bit	256 K	62.4	206.8	47.8
512 × 512	16-bit	512 K	131.6	414.9	86.2
1024 × 1024	8-bit	1 M	256.7	766.6	170.5
1024 × 1024	16-bit	2 M	504.6	1461.2	328.8