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By Man Ho Au, Joseph K. Liu, Tsz Hon Yuen, Duncan S. Wong (auth.), Hiroshi Yoshiura, Kouichi Sakurai, Kai Rannenberg, Yuko Murayama, Shinichi Kawamura (eds.)

ItwasourpleasuretoholdtheInternationalWorkshoponSecurity2006(IWSEC 2006) this 12 months in Kyoto and to post the lawsuits as a quantity of the Lecture Notes in computing device technology sequence. The workshop used to be our ?rst trial in that significant educational society teams on defense in Japan, viz. ISEC and CSEC, together prepared it; ISEC is a te- nical workforce on details protection of the Institute of Electronics, details and conversation Engineers (IEICE), and CSEC is a unique curiosity workforce on machine safety of the data Processing Society of Japan (IPSJ). It used to be Ryoichi Sasaki, the previous head of CSEC, who proposed keeping such a global workshop in Japan for the ?rst time, years in the past. the 2 teams supported his thought and began organizing the workshop. CSEC has its annual family symposium, the pc safety Symposium (CSS), in - tober for 3 days, and we made up our minds to arrange the workshop sooner than CSS this yr. The preliminary objective of the workshop used to be basically to supply younger researchers with the chance to provide their paintings in English. in spite of the fact that, as a result of extra submissions than we had expected, the standard of the authorised papers grew to become much better than we had anticipated. Theconferencereceived147submissions,outofwhichtheprogramcommittee chosen 30 for presentation. those lawsuits comprise the ?nal models of the approved papers, which the authors ?nalized at the foundation of reviews from the reviewers. due to the fact those revisions weren't topic to editorial assessment, the authors undergo complete accountability for the contents in their papers.

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Extra info for Advances in Information and Computer Security: First International Workshop on Security, IWSEC 2006, Kyoto, Japan, October 23-24, 2006. Proceedings

Example text

Output. Finally, A outputs a forged signature σ ∗ = (r∗ , T1∗ , T2∗ , T3∗ , V ∗ ) including a secret key A∗ . Using all Bij , we can identify the member. , the member is outside of all i), output σ ∗ . Otherwise, some i is identified. If si = 0, then output σ ∗ . , si = 1), abort. Then, there are two types of forger on the above framework. Type 1 forger forges a signature of the member who is different from all i. Type 2 forger forges a signature of the member i whose corruption is not requested.

U} refer to the secrets x1 , . . , xu . This SP K can be extended for different groups G1 and GT with the same order p, as follows. x x SP K{(x1 , . . , xu ) : C = fi1j1 · · · fivjv ∧ C = f xj1 i1 ···f xj v iv }(M ), where C, f1 , . . , ft ∈ G1 , and C , f1 , . . , ft ∈ GT . In the random oracle model, the SP K can be simulated without the knowledge using a simulator in the zero-knowledge-ness of the underlying P K. Moreover, the SP K has an extractor of the proved secret knowledge given two accepting protocol views whose commitments are the same and whose challenges are different.

T. e(T1 , w)/e(g1 , g2 ) = e(˜ g , g2 )ζ e(˜ g , w)α /e(T1 , g2 )xi , T2 = fˆβ+xi , ˆβ . T3 = h j (1) (2) (3) From (1), the equation e(T1 , w)e(T1 , g2 )xi = e(˜ g , g2 )ζ e(˜ g , w)α e(g1 , g2 ) holds. The xi left hand is equal to e(T1 , wg2 ). The right hand is equal to e(˜ g , g2ζ wα )e(g1 , g2 ). Thus, the equation e(T1 , wg2xi ) = e(˜ g, g2ζ wα )e(g1 , g2 ) holds. Define g˜ = g1η and γ θ T1 = g1 . Then, since w = g2 , we obtain the following equations. e(g1θ , g2γ g2xi ) = e(g1η , g2ζ g2αγ )e(g1 , g2 ) e(g1 , g2 )θ(γ+xi ) = e(g1 , g2 )η(ζ+αγ)+1 A Short Verifier-Local Revocation Group Signature Scheme 29 (η(ζ+αγ)+1)/(γ+x ) i Thus, θ(γ+xi ) = η(ζ +αγ)+1 (mod p), which means T1 = g1 = αγ+ζ 1/(γ+xi ) (g1 g˜ ) .

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