Digital data transmitted through the internet can be copied and used in malicious ways. This may cause problems referring to the protection of intellectual rights and the integrity of the transmitted information. Watermarking has emerged as a new technology that can be used to resolve these problems, providing either copyright claiming mechanisms or integrity verification tools. This article proposes an effective method of hiding watermark using discrete wavelet transform (DWT) and chaotic theory. The DWT algorithm and chaotic image encryption are suitably combined in this procedure to complete the process of hiding watermark and extracting watermark. The technique used here results in a significant reduction in encryption and decryption time.
展开▼
