Abstract
For the last 3 decades, the inclusion of chaos for the encryption of multimedia information is considered as a remarkable aspect of nonlinear dynamics. In this article, chaotic system along with substitution box is used for image encryption. Substitution box is constructed by the group action of the projective general linear group over a finite field. On multiple attempts, using the same security key the host image gives a different encrypted image which is the main feature of this scheme. For secure communication, this idea of chaos-based image encryption along with substitution box shows relatively improved results as depicted in simulation and security analysis. The scheme demonstrates resistance against image processing attacks.