Table 3 Correlation analysis of original and encrypted image.

From: A lightweight multi round confusion-diffusion cryptosystem for securing images using a modified 5D chaotic system

Sample images

Original image

Encrypted image

Horizontal

Vertical

Diagonal

Horizontal

Vertical

Diagonal

Sample1

0.9110

0.9419

0.8912

0.0045

0.0101

0.0104

Sample 2

0.9783

0.9677

0.9586

  − 0.0027

0.0017

0.0178

Sample 3

0.9565

0.9430

0.9409

0.0024

0.0042

0.0116

Sample 4

0.9667

0.9470

0.9370

  − 0.0110

0.0041

0.0085

Sample 5

0.9775

0.9791

0.9661

  − 0.0070

0.0091

0.0150

Sample 6

0.9695

0.9453

0.9137

0.0011

0.0022

0.0048

Sample 7

0.6052

0.6302

0.5335

  − 7.3561e−04

4.0267e−05

0.0044

Sample 8

0.8786

0.8848

0.7769

  − 0.0042

0.0022

0.0090

Sample 9

0.9614

0.9514

0.9499

5.2678e-04

0.1036

0.0114

Sample 10

0.9659

0.9579

0.9551

  − 0.0040

0.0117

0.0087

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