Communications and Multimedia Security: 9th IFIP TC-6 by L’ubica Staneková, Martin Stanek (auth.), Jana Dittmann,

By L’ubica Staneková, Martin Stanek (auth.), Jana Dittmann, Stefan Katzenbeisser, Andreas Uhl (eds.)

This ebook constitutes the refereed lawsuits of the ninth IFIP TC-6 TC-11 overseas convention on Communications and Multimedia safety, CMS 2005, held in Salzburg, Austria in September 2005.

The 28 revised complete papers and thirteen two-page abstracts awarded including four invited papers have been rigorously reviewed and chosen from 143 submissions. The papers are prepared in topical sections on utilized cryptography, DRM and e-commerce, media encryption, multimedia protection, privateness, biometrics and entry regulate, community safeguard, cellular safety, and XML security.

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Extra resources for Communications and Multimedia Security: 9th IFIP TC-6 TC-11International Conference, CMS 2005, Salzburg, Austria, September 19 – 21, 2005. Proceedings

Example text

In fact, spoofing attacks—like phishing and Web spoofing—show that currently deployed authentication mechanisms for Web applications are insufficient to protect users against fraudulent Web sites. When spoofing attacks on the Web were first introduced and discussed in [3], they were purely theoretical and only a few incidents really occurred in practice. This has changed dramatically, and contemporary e-commerce applications are severely threatened by phishing and Web spoofing attacks, which have proliferated and recently become a major nuisance on the Internet and WWW.

Km ∈ GF (q). For each j = 1, . . , m the group manager computes the vector zj = Kj v + ψ(D) Pj ∈ GF (q)t . The group manager sends privately to user i ∈ G1 the personal key Si = (ψ(i) P1 , . . , ψ(i) Pm ) ∈ GF (q)tm . Note that if we use a linear secret sharing scheme in which a user i is associated with mi ≥ 1 vectors, then his secret information Si consists of mi vectors of tm components. Full Addition. In order to add users Jj ⊂ U in session j, the group manager sends privately Si = (ψ(i) Pj , ψ(i) Pj+1 , .

PCj u iu = P j1 D1 . . P jv Dv . In these conditions, such 26 G. S´ aez a coalition does not get any information about the value of key Kj . Formally, it holds that: H(Kj |PjC1 i1 . . PjCu iu Br Bs ) = H(Kj ) for C1 , . . , Cu ∈ Γ, D1 , . . , Dv ∈ S such that PCj 1 i1 . . PCj u iu= P j1 D1 . . P jv Dv, C1 ∪ . . ∪ Cu = { 1 , . . , v } ⊂ Gj , D1 ∪ . . ∪ Dv = {i1 , . . , iu } ⊂ U − Gj and r ≤ j ≤ s. This definition has two differences with respect to the one presented in [1]. First the family of subsets that can be rejected in [1] is R = {R ⊂ U : |R| ≤ t} while in our definition we consider the general case of any possible monotone decreasing structure R, not only threshold ones.

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