[Retracted] A Double-Layer Image Encryption Scheme Based on Chaotic Maps and DNA Strand Displacement

Table 3

Correlation of adjacent pixels in plaintext and encrypted images.

Correlation	Original	Proposed	Ref. [15]	Ref. [18]	Ref. [26]	Ref. [28]
Horizontal	0.9719	−0.0002	0.0004	−0.0021	0.0024	−0.0077
Vertical	0.9444	0.0052	0.0021	0.0009	0.0012	0.0002
Diagonal	0.9163	0.0018	−0.0038	0.0003	0.0016	−0.0055