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Download e-book for kindle: Advances in Information and Computer Security: Second by Satoshi Hada, Kouichi Sakurai (auth.), Atsuko Miyaji,

By Satoshi Hada, Kouichi Sakurai (auth.), Atsuko Miyaji, Hiroaki Kikuchi, Kai Rannenberg (eds.)

ISBN-10: 3540756507

ISBN-13: 9783540756507

The foreign Workshop on safety (IWSEC 2007) used to be the second one within the annualseriesthat startedin 2006.IWSEC 2007washeld on the New Public corridor in Nara, Japan, in the course of October 29–31, 2007. This yr there have been 112 paper submissions, and from those 30 papers have been approved. authorised papers got here from 27 di?erent international locations, with the biggest percentage coming from Japan (12). Estonia, China, Korea, Spain, Taiwan and america contributed 2 papers every one and Canada, Germany, Greece, Poland, Turkeyand Vietnam contributed 1 paper each one. we might liketo thank all the authors who submitted papers to IWSEC 2007. The contributed papers have been supplemented by way of one invited speak from the - inent researcher Prof. Doug Tygar (UC Berkeley) in info safeguard. We have been lucky to have an lively staff of specialists who shaped this system Committee. Their names can be came across overleaf, and we're essentially thankful for all their nice e?orts. This staff used to be supported via an excellent greater variety of people who reviewedpapers of their particularareasof services. a listing of those names is additionally supplied; we are hoping it really is complete.

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Example text

2 Next, we examine whether the variance σm calculated by Eq. (4) approximate to that of non-watermarked components, which is an ideal estimation. In 2 , which accuracy will be a basic scheme, all components are used to calculate σm degraded by the watermarked components. In order to exclude such components efficiently, Eq. (4) is applied in our optimized scheme. The results are shown in Table 2. It is certified that the optimized scheme can obtain proper variances, hence thresholds can be designed based on the statistical property.

Our Contributions: We propose to use irreducible trinomials xm + axk + b over GF(3) such that w, bit length of word of targeted CPU (typical values of w are 16 and 32), divides k. We call the trinomials “reduction optimal trinomials (ROTs)”. ) Using ROT we are able to reduce the number of shift operations in reduction to less than half comparing with the case to use trinomials with general (including minimum) k. 46 T. Nakajima, T. Izu, and T. Takagi ROTs actually exist and not all k’s are minimum for corresponding m’s.

We use the 256 × 256 “lenna” image as the host signals, and choose = 1024, hence the total number of 106 . The detection of the fingerprint is performed with allowable users is 2 the knowledge of the host image. 1 Perceptual Quality We evaluate the relation between a watermark strength and image quality. Considering that the degradation in the image will be noticeable when PSNR is less than 39 dB, we suppose that α0 = α1 = 500 are the maximum strength and assume them as the criterion of the image quality.

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Advances in Information and Computer Security: Second International Workshop on Security, IWSEC 2007, Nara, Japan, October 29-31, 2007. Proceedings by Satoshi Hada, Kouichi Sakurai (auth.), Atsuko Miyaji, Hiroaki Kikuchi, Kai Rannenberg (eds.)


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