![]() If secret information is modified throughout steganography, it'd defeat the whole purpose of the method. The key message should not change in any manner, such as further information being added, loss or changes to the key information once it has been hidden. The integrity of the hidden information once it's been embedded within the stego object must be correct. The subsequent may be a list of main requirements that steganography techniques should satisfy: However, all of the protocols and techniques should satisfy variety of requirements so steganography will be applied properly. There are many various protocols and embedding techniques that enable us to hide data in a given object. In the correlation based detection the first watermark sequence is compared with the extracted watermark sequence. Hence to validate the existence of watermark, either the original object is used to match and find out the watermark signal (non-blind watermarking) or a correlation measure is used to detect the strength of the watermark signal from the extracted watermark (blind watermarking). This extracted watermark may or may not resemble the first watermark as a result of the attack. Using the key, the embedded watermark sequence is often extracted. When the owner desires to see the watermarks within the probably attackedĪnd distorted multimedia object, s/he relies on the key that was used to embed the watermark. The attacks are often unintentional (in case of pictures, low pass filtering or gamma correction or compression) or intentional (like cropping) therefore the watermark needs to be very robust against these possible attacks. Once the watermark is embedded it will experience many attacks as a result of the multimedia object being digitally processed. The embedding method is guided by use of a secret key that determines the locations inside the transmission object (image) where the watermark would be embedded. A watermarking algorithmic program embeds a visible or invisible watermark in a given multimedia object Content suppliers want to enter watermarks in their multimedia objects (digital content) for several reasons like copyright protection, content authentication, tamper detection etc. Watermark is considered as a sort of a signature that reveals the owner of the multimedia object. The process of embedding a watermark during a multimedia object is termed as watermarking. Watermarking, Watermark Detection, Spatial Domain, Image Transforms, DWT, DCT, DFT. This will be further divided into watermarking and which will be mentioned later. The other major area of steganography is copyright marking, where the message to be inserted is used to claim copyright over a document. In this case the aim is to stop the message from being detected by any other party. Steganography will be used to hide a message supposed for later retrieval by a selected individual or group. The figure shows how data hiding will be broken down into totally different areas. Hence to shield the interest of these suppliers, the digital content is watermarked. Proprietary material can be simply changed over peer-to-peer networks, and this has caused major issues to those content suppliers. The benefit with which digital content is changed over the web has created infringement of copyright problems. Watermarking is a branch of data concealing that is used to hide proprietary data in digital media like photographs, digital music, or digital video. We classify the techniques based on completely different domains in which data is embedded. In this paper we tend to present an in depth survey of existing and recently proposed steganographic and watermarking techniques. Steganography is used for secret communication, whereas Watermarking is used for content protection, copyright management, content authentication and tamper detection. There is a lot of work being conducted in several branches in this field. Watermarking, which belongs to the data hiding field has seen plenty of research interest recently. Name of Authors: Monal Mehta, Abhishek Shetty ![]()
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