By Minoru Kuribayashi, Hatsukazu Tanaka (auth.), Gerhard Goos, Juris Hartmanis, Jan van Leeuwen, Josef Pieprzyk, Jennifer Seberry, Eiji Okamoto (eds.)
ISBN-10: 3540414169
ISBN-13: 9783540414162
ISBN-10: 3540444564
ISBN-13: 9783540444565
The 3rd foreign Workshop on details defense used to be held on the U- versity of Wollongong, Australia. The convention was once backed through the Centre for machine safeguard learn, collage of Wollongong. the most issues of the convention have been the newly rising problems with info defense. Mul- media copyright defense and safety points of e-commerce have been themes that essentially re?ect the focal point of the convention. safeguard of the copyright of digital files appears pushed through powerful sensible call for from the for brand new, e cient and safe options. even if e-commerce is already booming, it has now not reached its complete strength by way of new, e cient and safe e-commerce protocols with further homes. there have been sixty three papers submitted to the convention. this system committee authorised 23. of these accredited, six papers have been from Australia, ve from Japan, each one from Spain, Germany and the us, and one every one from Finland and Sweden. 4 papers have been co-authored by means of overseas groups from Canada and China, Korea and Australia, Taiwan and Australia, and Belgium, France and Germany, respectively. ultimate types of the approved papers have been accumulated utilizing computing and different assets of the Institute of arithmetic, Polish Academy of Sciences, Warsaw, Poland. we're in particular thankful to Jerzy Urbanowicz and Andrzej Pokrzywa for his or her aid in the course of practise of the proceedings.
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Additional info for Information Security: Third International Workshop, ISW 2000 Wollongong, Australia, December 20–21, 2000 Proceedings
Example text
It holds: the smaller , the smaller the difference l − k must be chosen. The embedding of additional information. At this point the picture still consists only of reference colours, which are now the starting point for embedding. Because we want to exploit the visually low prioritised chrominance channels, the YUV-colour system is used. Here, the embedding algorithm considers only one channel and works as follows: 1. 2. 3. 4. 5. Consider the chrominance value of a given pixel. Read a bit from emb.
If the chrominance value of the given pixel is smaller than the chrominance value of the associated reference colour, the next bit of embedded information is “0”. 5. If the chrominance value of the given pixel is larger than the chrominance value of the associated reference colour, the next bit of embedded information is “1”. 6. Go to the next pixel. After the end of the algorithm the additional information is extracted and the message was transferred. 2 Runtime Adaptivity By the use of reference colours as reference points for extraction, different modifications and adjustments can be realised at runtime of the proposed steganographic system.
Weightings over 1% can be perceived. Fig. 2. Difference between physically absorbed and perceived luminance. Non-linear luminance embedding Luminance values which are very large (> 100) and values which lie below the perception threshold should be modified during embedding. 5 Potential Cover Images The advantage of steganography is the free choice of a suitable cover image for the embedding. Through the multitude of possibilities which are offered by steganography in digital images, it appears difficult to give an universally valid statement for potential covers.
Information Security: Third International Workshop, ISW 2000 Wollongong, Australia, December 20–21, 2000 Proceedings by Minoru Kuribayashi, Hatsukazu Tanaka (auth.), Gerhard Goos, Juris Hartmanis, Jan van Leeuwen, Josef Pieprzyk, Jennifer Seberry, Eiji Okamoto (eds.)
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