Read e-book online Advances in Information and Computer Security: Second PDF

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

The overseas Workshop on protection (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 yr there have been 112 paper submissions, and from those 30 papers have been authorised. accredited papers got here from 27 di?erent international locations, with the most important percentage coming from Japan (12). Estonia, China, Korea, Spain, Taiwan and america contributed 2 papers each one and Canada, Germany, Greece, Poland, Turkeyand Vietnam contributed 1 paper every one. we'd liketo thank the entire authors who submitted papers to IWSEC 2007. The contributed papers have been supplemented by means of one invited speak from the - inent researcher Prof. Doug Tygar (UC Berkeley) in info safety. We have been lucky to have an brisk staff of specialists who shaped this system Committee. Their names will be chanced on overleaf, and we're clearly thankful for all their nice e?orts. This staff used to be supported by way of a fair higher variety of people who reviewedpapers of their particularareasof services. an inventory of those names is usually supplied; we are hoping it really is complete.

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This choice in fact leads to search for irreducible trinomials with minimum k corresponding to m. Barreto pointed out that trinomials with k ≡ m (mod 3) are useful for efficient computation of cube roots in GF(3m ). Since these choices are for cubing or cube root, the effectiveness of the choices depends on pairing algorithm used. Actually there is a version of the ηT pairing (and the Duursma-Lee algorithm) without cube roots and costs of cubings are rather small comparing with those of multiplications.

2) Extract 2 DCT coefficients randomly from the low or middle frequency elements using a secret key, and create 2 sequences, v0 and v1 of length . 3) Embed i0 and i1 to v0 and v1 , respectively, by the following procedure. • group ID i0 a) Generate PN sequence P N (s) of length using a secret key s as a seed, where the PN sequence consists of ±1. ) b) Multiply v0 by P N (s) and apply 1- dimensional DCT (1-D DCT) to obtain an orthogonal sequence for embedding i0 , which is denoted by vˆ0 = {vˆ0 (0), vˆ0 (1), .

In our scheme, the allowable number of users is 2 , and the fingerprint is denoted by (i0 , i1 ), where i0 represents group ID and i1 represents user ID. The embedding procedure is summarized as follows. 1) Apply full-domain DCT to host image. 2) Extract 2 DCT coefficients randomly from the low or middle frequency elements using a secret key, and create 2 sequences, v0 and v1 of length . 3) Embed i0 and i1 to v0 and v1 , respectively, by the following procedure. • group ID i0 a) Generate PN sequence P N (s) of length using a secret key s as a seed, where the PN sequence consists of ±1.

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