By Satoshi Hada, Kouichi Sakurai (auth.), Atsuko Miyaji, Hiroaki Kikuchi, Kai Rannenberg (eds.)
The overseas Workshop on safeguard (IWSEC 2007) was once 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 12 months there have been 112 paper submissions, and from those 30 papers have been authorized. authorised papers got here from 27 di?erent nations, with the biggest share coming from Japan (12). Estonia, China, Korea, Spain, Taiwan and the us contributed 2 papers each 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 details defense. We have been lucky to have an brisk workforce of specialists who shaped this system Committee. Their names should be stumbled on overleaf, and we're in actual fact thankful for all their nice e?orts. This crew used to be supported by means of a fair greater variety of people who reviewedpapers of their particularareasof services. a listing of those names is usually supplied; we are hoping it really is complete.
Read Online or Download Advances in Information and Computer Security: Second International Workshop on Security, IWSEC 2007, Nara, Japan, October 29-31, 2007. Proceedings PDF
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Additional resources for Advances in Information and Computer Security: Second International Workshop on Security, IWSEC 2007, Nara, Japan, October 29-31, 2007. Proceedings
Morii frequency domain. Only the owner knows the precise patterns of the watermark that is modulated by combination of DCT and PN sequence. In contrast, for an attacker the strategy to get the watermarked sequence is not realistic because he must know each parameters containing secret key used in the embedding procedure. Since an attacker only has knowledge of the possible range of modiﬁcation, an attacker must create audible/visible defects in the data to eliminate a watermark. As other collusion attack, we assume that colluders obtain the diﬀerence by subtracting the watermarked signal from the other watermarked one, and exploit it to add noise to the watermarked signal in order to eliminate a watermark.
Even in this case, we can detect the embedded watermark and identify the colluders by using an appropriately designed threshold. This scheme has excellent robustness against signal processing, geometric distortions and subterfuge attacks . However, it is not theoretically proven whether each SS sequence used in the scheme is (quasi-)orthogonal to each other. If some of them were correlated each other, the performance might be degraded. In order to get more robustness against averaging collusion, we have to use (quasi-)orthogonal sequences.
The other is to exploit Spread Spectrum (SS) technique [2,5,6]. In the scheme, sequences which follow a normal distribution are assigned to each user as a ﬁngerprint, and an excellent collusion resilience property is archived. Kirovski et al. proposed a dual watermark/ﬁngerprint system that allows the use of diﬀerent watermark signals in embedding and extraction , and an attack analysis and evaluation for the system are discussed in . In , each user is supposed to have own media player that contains a watermark detector and its detection key which is sum of a common watermark and a ﬁngerprint, and distributed contents are marked with the common watermark.
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.)