tIn this paper a new fragile watermarking algorithm is proposed that is built upon the cryptanalysis ofthe CWSA algorithm (Chaotic Watermarking Scheme for Authentication of JPEG Images – Wang et al.[14]). The proposed algorithm preserves the advantages of CWSA, but is robust against cryptanalysis,faster and less perceptible. It uses two chaotic maps: the piecewise linear chaotic map and a chaoticgenerator composed of two perturbed recursive filters with a nonlinear function, the Skew Tent map.Experimental results show that the proposed algorithm provides good performances in terms of security,imperceptibility, speed and resistance to cryptographic attacks.