Table 2 Key space of different algorithms.

From: A new image encryption scheme based on fractional-order hyperchaotic system and multiple image fusion

Our algorithm

Ref.53

Ref.54

Ref.55

Ref.56

Ref.57

2\(^{750}\)

2\(^{213}\)

2\(^{580}\)

2\(^{497}\)

2\(^{374}\)

2\(^{399}\)

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