Abstract
We present a hybrid and robust encryption and watermarking algorithm based on a new chaotic map key generation method. The chaotic map uses a rule to generate the encryption key using an innovative approach. The main goal is to propose a hybrid scheme by applying a One Time Pad (OTP) encryption algorithm and a semi-blind watermarking approach to the host medical image. The encrypted watermark is embedded in the encrypted host image, directly in the spatial domain. The results obtained show perfect watermark extraction even after applying some attack scenarios. Using this approach, we conclude that our technique has a high robustness and a remarkable resistance against geometric, non-geometric and encryption attacks.