A Novel Image Encryption Scheme Based on PWLCM and Standard Map

Abstract EN

In the past decades, considerable attention has been paid to the chaos-based image encryption schemes owing to their characteristics such as extreme sensitivity to initial conditions and parameters, pseudo-randomness, and unpredictability.

However, some schemes have been proven to be insecure due to using a single chaotic system.

To increase the security, this work proposes a novel image encryption scheme based on the piecewise linear chaotic map (PWLCM) and the standard map.

To the best of our knowledge, it is the first chaos-based image encryption scheme combining the PWLCM with the standard map, which adopts permutation-diffusion structure.

Unlike the traditional scrambling way, a hierarchical diffusion strategy, which not only changes the pixel position but also modifies the value, is employed in the permutation phase.

The operation model of row-by-row and column-by-column is further used to enhance the efficiency in the diffusion process.

Consequently, a good trade-off efficiency and security can be achieved.

Furthermore, the numerical simulations and performance analyses illustrate that the proposed encryption scheme can be used in practical application scenarios requiring lightweight security.