Research and implementation of fragile watermark for vector graphics

The methods of integrity authentication for vector graphics were described at first, then digital watermarking for vector graphics was introduced. For vector graphics composed by linear entities, a fragile watermark algorithm was proposed, which was based on that the linear entities of vector graphics were divided into different groups, and watermark information was embedded in these groups. The extraction procedure not only verifies the integrity of the watermarked vector graphics, but also locates modification. The watermarked vector graphics can be used for its data is modified slightly, and the original vector graphics can be restored by extraction procedure for special application.