Research Article

A Novel Image Encryption Algorithm Based on the Delayed Maps and Permutation-Confusion-Diffusion Architecture

Table 5

Information entropy of gray images.

RoundImage nameGlobal entropyLocal entropyCritical value
No. of blocks = 30
Block size = 44 ∗ 44

1 roundLena7.99727.9024PassPassPass
Peppers7.99727.9028PassPassPass
Boats7.99727.9025PassPassPass
Man7.99727.9027PassPassPass
Camera7.99727.9025PassPassPass

2 roundsLena7.99727.9027PassPassPass
Peppers7.99727.9025PassPassPass
Baboon7.99727.9026PassPassPass
Man7.99737.9027PassPassPass
Camera7.99727.9028PassPassPass