Security Evaluation of DWT Based Watermarking Schemes and its Improvement Using RS Coding

In this study, information theory is used to provide both theoretical and practical analysis of security offered by watermarking and data hiding techniques based on wavelet transform. In this context, security level is defined as the equivocation of the secret parameters. On the theoretical side, the measure of security is estimated by means of information theory tools for all possible attacks. On the practical side, simulations assess the security levels derived in the theoretical part of paper to reveal the fundamental limits and bounds on security and show the trade off between security and other properties, such as robustness and imperceptibility. Also, the error correcting codes is used to decline effects of these limits. Experimental works indicate that the error correcting codes, such as Reed-Solomon code can be greatly effective for increasing the security of many watermarking schemes.