Comments and Proofs to Published Paper - A Novel Reversible Robust Watermarking Algorithm Based on a Chaotic System

Information hiding is an emerging research area which includes applications such as copyright management [4], tamper detection and content authentication. Existing chaos optimization and random position selection based watermarking embedding methods make claims for robustness and reversibility; however, reversibility becomes questionable when data capacity is high. In a published paper, authors proposed a watermarking algorithm based on a chaotic system, which claims to be reversible; however, based on our experimental results, the existing method suffers from overflow and underflow issues regardless of initial values.