Cybersecurity

Table 6 NPCR, UACI, and correlation coefficients of RBFK ciphers

From: RBFK cipher: a randomized butterfly architecture-based lightweight block cipher for IoT devices in the edge computing environment

Images			RBFK-128	RBFK-64
Child	Correlation coefficient	Plain image	0.9750	0.9750
		Encrypted image	− 0.0008	− 0.0067
	Percentage of NPCR		99.6109	99.6109
	Percentage of UACI		16.7364	16.6811
	Entropy	Plain image	7.5597	7.5597
		Encrypted image	7.9975	7.9975
Bridge	Correlation coefficient	Plain image	0.9626	0.9626
		Encrypted image	− 0.0044	− 0.0046
	Percentage of NPCR		99.6292	99.5712
	Percentage of UACI		14.9606	15.0790
	Entropy	Plain image	7.5856	7.5856
		Encrypted image	7.9967	7.9977
Baboon	Correlation coefficient	Plain image	0.8198	0.8198
		Encrypted image	0.0015	− 0.0031
	Percentage of NPCR		99.6292	99.6307
	Percentage of UACI		13.2555	13.2777
	Entropy	Plain image	7.2316	7.2316
		Encrypted image	7.9967	7.9969
Football	Correlation coefficient	Plain image	0.9616	0.9616
		Encrypted image	0.0044	− 0.0004
	Percentage of NPCR		99.6521	99.6078
	Percentage of UACI		26.2973	25.9850
	Entropy	Plain image	6.6839	6.6839
		Encrypted image	7.9973	7.9973
Cat	Correlation coefficient	Plain image	0.8967	0.8967
		Encrypted image	0.0015	− 0.0021
	Percentage of NPCR		99.6075	99.5651
	Percentage of UACI		26.5610	26.4219
	Entropy	Plain image	7.4538	7.4538
		Encrypted image	7.9969	7.9977

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