A Novel Cryptographic System with Adjustable Secret Key Space for Color Image Security Using Nonlinear Adaptive Filter

In this paper, we propose a novel chaos-based cryptographic system for enhancing color image security by using chaotic amplitude phase frequency model nonlinear adaptive filter. The advantage of the proposed scheme is that it possesses the ability of "adjustable secret key space" in order to get the enough security strength to protect color image. Furthermore, the experimental results and security analyses demonstrate that the proposed method has a fine security performance. The "adjustable secret key space" can overcome the security strength issue for obtaining enough secret key length, which can use external signal to adjust the required secret key space without changing the original cryptographic infrastructure.