Spread-Spectrum Watermarking Security

Spread-Spectrum Watermarking Security

Abstract

            This paper presents both theoretical and practicalanalyses of the security offered by watermarking and data hiding methods based on spread spectrum. In this context, security is understood as the difficulty of estimating the secret parameters of the embedding function based on the observation of watermarked signals. On the theoretical side, the security is quantified from an information-theoretic point of view by means of the equivocation about the secret parameters. The main results reveal fundamental limits and bounds on security and provide insight into other properties, such as the impact of the embedding parameters, and the tradeoff between robustness and security. On the practical side, workable estimators of the secret parameters are proposed and theoretically analyzed for a variety of scenarios, providing a comparison with previous approaches, and showing that the security of many schemes used in practice can be fairly low.

Algorithm Used :

WaterMarking Algorithm

Algorithm Description :

In invisible watermarking, information is added as digital data to audio, picture or video, but it cannot be perceived as such (although it is possible to detect the hidden information). An important application of invisible watermarking is to copyright protection systems, which are intended to prevent or deter unauthorized copying of digital media. Steganography is sometimes applied in digital watermarking, where two parties communicate a secret message embedded in the digital signal. Annotation of digital photographs with descriptive information is another application of invisible watermarking. While some file formats for digital media can contain additional information called metadata, digital watermarking is distinct in that the data is carried in the signal itself.

Existing System :

In visible watermarking, the information is visible in the picture or video. Typically, the information is text or a logo which identifies the owner of the media. The image on the right has a visible watermark. When a television broadcaster adds its logo to the corner of transmitted video, this is also a visible watermark.

 Proposed System :

Watermark detection is modeled as a hidden hypothesis testing problem where the watermark detector has to decide whether the received signal has been watermarked or not. If this received signal belongs to a certain region of the space, called “acceptance region” (which is dependent on the watermarking method and a secret key), then it is spotted as watermarked.

Hardware Requirements

•         SYSTEM            : Pentium IV 2.4 GHz

•         HARD DISK                : 40 GB

•         FLOPPY DRIVE         : 1.44 MB

•         MONITOR                   : 15 VGA colour

•         MOUSE              : Logitech.

•         RAM                             : 256 MB

Software Requirements

•         Operating system         :- Windows XP Professional

•         Front End                     : -  visual studio 2005.

•         Coding Language         :- Visual C# .Net

•         Back-End            : - Sql Server 2000.

Advantage

1.    More secure for the authorized user for there data.

2.    Hackers will not be easily find this method.

Disadvantage

1.timing consuming will be more for providing this security.