Fast and Robust Image Encryption Scheme Based on Quantum Logistic Map and Hyperchaotic System

Table 2

Key space comparative analysis.

Encryption scheme	Key space
Ref. [4]	2^256
Ref. [15]	2^125
Ref. [24]	10^15×3 + 2^256
Ref. [35]	2^186
Ref. [37]	2^364
Proposed algorithm	2^392.5