Dream Place Essay Example

one user and embedded into that user's copy prior to distribution. Illicit copying is detected when a watermark is extracted from suspicious content and correlated with the watermark of each legitimate user. A user with a correlation higher than the threshold limit is declared to be a colluded. An additional hard detector can also be employed depending on the detection confidence required. 4 Figure 1 . A framework for Jointly coding and embedding digital watermarking.

More specifically, we employ a traceability code as the q-ray outer code, which can be instructed with a large minimum distance using an additional error-correcting code. To embed a codeword we use mutually orthogonal (independent) sequences to modulate the q symbols. At present, the sequence corresponding to each symbol in a user's codeword is usually embedded into one segment of the multimedia content. In our alternative design, we divide each sequence into subsequences and randomly permute these subsequences before embedding. The same permutation applies to all user content Ana Is reversed at ten detector sloe.

Hogue 2 snows a comparison AT the performance of our scheme under a collision attack against a conventional scheme. We measure the probability of catching one colluded PDP during collusion attacks against different numbers of colludes. The results show that if we require PDP to be close to 1, the proposed scheme increases the collision resistance from 6 to 24, a threefold improvement. We have also tested the performance of the proposed scheme under minority collusion attacks, and the collusion resistance has been increased from 3 to 20.

Protecting multimedia content from unauthorized redistribution is a challenging task in the modern digital era. Digital watermarking

is an emerging technology that can address the problem by recording evidence of illegal activity that later can be retrieved forensically, and therefore function as a deterrent. Our research shows that significant advantages in security can be achieved by using jointly coded and embedded digital watermarks. Our future work is aimed at further improving the design for lower computational complexity, and increasing resistance to a large number of colludes.