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Attacks on Image Watermark

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Submitted By shvmrulz
Words 3840
Pages 16
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WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG GEQR qwwde wer w etr ag a FQ WER FSD GT4 RQ AVSD GR WEF GR SDF SWF E GE WREQ WERGER AER AG GEGEQR EGGGG ERG E GQER ERG 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...embedded information. It serves as a better way of securing message than cryptography which only conceals the content of the message not the existence of the message. Original message is being hidden within a carrier such that the changes so occurred in the carrier are not observable. In this paper we will discuss how digital images can be used as a carrier to hide messages. This paper also analyses the performance of some of the steganography tools. Steganography is a useful tool that allows covert transmission of information over an over the communications channel. Combining secret image with the carrier image gives the hidden image. The hidden image is difficult to detect without retrieval. This paper will take an in-depth look at this technology by introducing the reader to various concepts of Steganography, a brief history of Steganography and a look at some of the Steganographic technique. In steganography, the possible cover carriers are innocent looking carriers (images, audio, video, text, or some other digitally representative code) which will hold the hidden information. A message is the information hidden and may be plaintext, cipher text, images, or anything that can be embedded into a bit stream. Together the cover carrier and the embedded message create a stego-carrier. Hiding information may require a stego key which is additional secret information, such as a password, required for embedding the information. For example, when a secret message is...

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...Neutral Sentences Is Doubtfully Effective  Secret inside What is steganography? What is it used for? ● ● ● Hiding the fact that you are sending messages Hiding several messages inside data Digital watermarking Kerckhoffs' principle ● ● Secure with knowlegde of the system Message can only be read with secret key What is steganography? Hiding several messages ● ● ● ● Deniable cryptography Knowledge of encrypted data No proof of how much information is stored Rubberhose (http://www.rubberhose.org) What is steganography? Digital watermarking ● ● ● ● Not really hiding information Important: not modificable Uses the hiding-property of steganography Recent: MPAA hides watermarks in movies Implementation Hiding information ● ● ● ● Text / Webpages Images Audio Video Implementation Text / Webpages ● ● ● ● ● Use of a codebook Layout of texts Every Nth character Use of whitespaces and newlines Can be difficult to detect and decode Implementation Text / Webpages In the midway of this our mortal life, I found me in a gloomy wood, astray Gone from the path direct: and e'en to tell It were no easy task, how savage wild That...

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Cis 60

...hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity. Well through the 20th century, stenography was a necessary skill for secretaries, reporters, and other people who needed to quickly and accurately record written information. In all cases, the goal of stenography is to make it easy to write something down quickly and with great accuracy. Using stenography, someone can record information much more quickly than he or she could be writing. Like many security tools, steganography can be used for a variety of reasons, some good, some not so good. Legitimate purposes can include things like watermarking images for reasons such as copyright protection. Digital watermarks are similar to steganography in that they are overlaid in files, which appear to be part of the original file and are thus not easily detectable by the average person. Further,...

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Steganography

...Steganography Hide and Seek: An Introduction to Steganography Although people have hidden secrets in plain sight— now called steganography—throughout the ages, the recent growth in computational power and technology has propelled it to the forefront of today’s security techniques. N IELS PROVOS AND PETER HONEYMAN University of Michigan teganography is the art and science of hiding communication; a steganographic system thus embeds hidden content in unremarkable cover media so as not to arouse an eavesdropper’s suspicion. In the past, people used hidden tattoos or invisible ink to convey steganographic content. Today, computer and network technologies provide easy-to-use communication channels for steganography. Essentially, the information-hiding process in a steganographic system starts by identifying a cover medium’s redundant bits (those that can be modified without destroying that medium’s integrity).1 The embedding process creates a stego medium by replacing these redundant bits with data from the hidden message. Modern steganography’s goal is to keep its mere presence undetectable, but steganographic systems— because of their invasive nature—leave behind detectable traces in the cover medium. Even if secret content is not revealed, the existence of it is: modifying the cover medium changes its statistical properties, so eavesdroppers can detect the distortions in the resulting stego medium’s statistical properties. The process of finding these distortions is called...

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