Cryptanalysis of image confidentiality scheme based on hybrid chaotic maps

Chaos-based encryption has come to prominence as an efficient and lightweight approach to secure image communication. A recently proposed scheme using both one dimensional (1D) logistic map and two dimensional (2D) sin-cosine map showed high resistance to statistical and differential attacks. A thorough cryptanalysis, however, shows vulnerability to chosen-plaintext attacks (CPA), mainly the result of weak sensitivity to keys and implementation issues. In our study, we provide a systematic CPA of the elementary algorithm, confirmed using experimental evaluation. To counter these limitations, we put forth an augmented encryption model with enhanced chaotic parameter coupling and adaptive key scheduling. With the revised design, there is much increased resistance to cryptanalysis, offering secure image transmission in resource-constrained environments.