A Robust and Fast Image Encryption Scheme Based on a Mixing Technique

Table 6

UACI and NPCR values of encrypted images.

Changed pixel position				[44] (2018)	[37] (2020)	[51] (2020)
Plain image	Metric	First pixel	Middle pixel				Last pixel
Cameraman (256  256)	NPCR	99.62	99.61	99.62	—	99.62	99.63
	UACI	33.54	33.55	33.53	—	33.42	33.63
Lena (512  512)	NPCR	99.62	99.62	99.61	99.61	99.63	99.62
	UACI	33.46	33.47	33.46	30.47	33.52	33.28
Plane (900  600)	NPCR	99.63	99.62	99.62	99.60	—	99.60
	UACI	33.47	33.48	33.47	32.60	—	33.42
Mixture (512  512)	NPCR	99.61	99.61	99.61	—	—	—
	UACI	33.42	33.41	33.42	—	—	—