A ship image encryption algorithm based on novel spatiotemporal chaotic system

Abstract In order to prevent the remote-controlled lookout images of intelligent ships from being maliciously stolen or tampered with, and to ensure navigation and operation safety, this paper proposes an image encryption scheme based on ship-shore information transmission. The proposed scheme introduces the Sine Embedded Dynamic Random Coupled Map Lattice (SEDRCML), which replaces the static coupling coefficients e with a one-dimensional sine chaotic mapping. This modification enhances the system by exhibiting strong spatio-temporal dynamics and desirable chaotic properties. Additionally, it addresses the issue of unequal energy distribution among lattice points in the static coupling lattice. Based on the SEDRCML system, a novel bit-level encryption algorithm is developed to secure the remote lookout images of intelligent ships. This algorithm is primarily designed as a 3D dynamic multi-directional block zigzag-synchronous scrambling and diffusion algorithm, which simultaneously obfuscates pixel positions and modifies their values, thereby improving encryption efficiency. Simulation results of the proposed encryption and decryption algorithms indicate that the scheme provides a higher level of security for ship-shore image information transmission in remote control scenarios.