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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 yr in Kyoto and to put up the lawsuits as a quantity of the Lecture Notes in desktop technology sequence. The workshop used to be our ?rst trial in that significant educational society teams on safeguard in Japan, viz. ISEC and CSEC, together geared up it; ISEC is a te- nical workforce on details protection of the Institute of Electronics, details and verbal exchange Engineers (IEICE), and CSEC is a unique curiosity staff on desktop safety of the knowledge Processing Society of Japan (IPSJ). It used to be Ryoichi Sasaki, the previous head of CSEC, who proposed protecting such a global workshop in Japan for the ?rst time, years in the past. the 2 teams supported his concept and began organizing the workshop. CSEC has its annual household symposium, the pc protection Symposium (CSS), in - tober for 3 days, and we determined to prepare the workshop sooner than CSS this yr. The preliminary target of the workshop used to be basically to supply younger researchers with the chance to give their paintings in English. in spite of the fact that, because of extra submissions than we had expected, the standard of the accredited papers grew to become much better than we had anticipated. Theconferencereceived147submissions,outofwhichtheprogramcommittee chosen 30 for presentation. those complaints include the ?nal types of the authorized papers, which the authors ?nalized at the foundation of reviews from the reviewers. seeing that those revisions weren't topic to editorial evaluation, the authors endure complete accountability for the contents in their papers.

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

Example text

Fˆ = ψ(f ), and h 2. B selects T1 ∈R G1 . Furthermore, B sets T2 = ψ(Z) and T3 = ψ(v b ) = ˆ β∗ . Note that if Z = ha+b , T2 = ψ(ha+b ) = fˆβ+xi∗ . h j 3. B computes the simulated SP K V by using the simulator of the perfect zero-knowledge-ness. Furthermore, B defines f = H0 (gpk, M, r). Phase 2. This is the same as Phase 1. Output. A outputs its guess φ ∈ {0, 1}. If φ = φ , B outputs ω = 1 (implying Z = ha+b ), and otherwise outputs ω = 0 (implying Z = hc ). Now, we evaluate the advantage of the guess of B.

We let C : Const → Str be a function that (deterministically) assigns a constant bit string to each constant identifier. We let N : Param → Str be the nonce generation function that, given a unary sequence of length η, chooses uniformly and randomly a bit string from {0, 1}η . 4. For a message m, a value of the security parameter η ∈ N, a finite set U of messages containing R(m), and for a choice τ ∈ Coins(U ) of (at least) all the randomness in m, we can (deterministically) create a bit string τ [[m]]η ∈ Str as follows: τ {η = E([[k]]η , [[m]]η , τ ({|m|}rk )) τ [[hr(m)]]η = H(1η , [[m]]η , τ (hr(m))) [[c]]η = C(c) [[k]]η = K(1η , τ (k)) τ [[n]]η = N (1η , τ (n)) [[ τ m1 , m2 ]]η τ = τ τ [[m1 ]]η [[m2 ]]η τ| τ τ τ τ [[ [[ r τ ]]η r τ ]]η τ τ = E([[k ]]η , C(0), τ ( = H(1 , [[n η r τ ]]η , τ ( r r )) )).

Nakanishi and N. Funabiki mobile hosts anonymously communicate with the servers. We refer to this type as Verifier-Local Revocation (VLR) group signature scheme, as in [6,12]. In [14,2], VLR group signature schemes based on the strong RSA assumption are proposed. However, the schemes have some drawbacks on efficiency. The first scheme of [14] and the scheme of [2] suffer from the inefficiency of signing, due to the used inefficient zero-knowledge proofs. The second scheme of [14] forces a signer to compute O(T ) exponentiations at every time interval, where T is the total number of time intervals.

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