Sequence families sets constructed from quadratic congruence codes for use in secure spread spectrum watermarking for multimedia

Digital watermarking for multimedia information has been widely adopted as a measure to detect copyright infringements. In many watermarking schemes, often only one watermarking signature is used in the embedding of hidden information. This paper introduces new multiple sequence families with good auto- and cross-correlation properties, which are ideal in the application of digital watermarking. It is also envisaged that the good cross-correlation property of these multiple families of sequences allows for the use of multiple signatures in a watermarking scheme. Multiple signatures increases the robustness of the watermarking scheme and also retrieving for independent signatures is straightforward due to the low cross-correlation property of the the member sequence