Advances in Computer Science and Information Technology: by Nurzaini Mohamad Zain, Ganthan Narayana Samy, Rabiah Ahmad,

Advances in Computer Science and Information Technology: by Nurzaini Mohamad Zain, Ganthan Narayana Samy, Rabiah Ahmad,

By Nurzaini Mohamad Zain, Ganthan Narayana Samy, Rabiah Ahmad, Zuraini Ismail (auth.), Tai-hoon Kim, Hojjat Adeli (eds.)

Advanced technological know-how and expertise, complex conversation and Networking, details protection and coverage, Ubiquitous Computing and Multimedia Appli- tions are meetings that allure many educational and execs. The objective of those co-located meetings is to assemble researchers from academia and in addition to practitioners to percentage rules, difficulties and recommendations with regards to the multifaceted facets of complex technology and know-how, complicated conversation and networking, details safety and insurance, ubiquitous computing and m- timedia functions. This co-located occasion integrated the subsequent meetings: AST 2010 (The moment overseas convention on complex technology and Technology), ACN 2010 (The moment foreign convention on complicated communique and Networking), ISA 2010 (The 4th foreign convention on info protection and coverage) and UCMA 2010 (The 2010 foreign convention on Ubiquitous Computing and Multimedia Applications). we wish to precise our gratitude to all the authors of submitted papers and to all attendees, for his or her contributions and participation. We think within the want for carrying on with this venture sooner or later. We recognize the nice attempt of all of the Chairs and the contributors of advisory forums and software Committees of the above-listed occasions, who chosen 15% of over 1,000 submissions, following a rigorous peer-review procedure. distinct thank you visit SERSC (Science & Engineering study help soCiety) for assisting those - situated conferences.

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Additional info for Advances in Computer Science and Information Technology: AST/UCMA/ISA/ACN 2010 Conferences, Miyazaki, Japan, June 23-25, 2010. Joint Proceedings

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For any identity u and any message m, we have F (u) J(u) U =u ui = g2 i∈U g K(m) L(m) ,m mj = g 2 j∈M g An ID-Based Anonymous Signcryption Scheme for Multiple Receivers Secure 23 First stage: D answers the queries as follows: Extract queries. When the adversary asks for the private key corresponding to an identity U. The distinguisher D first checks if F (U) = 0 and aborts in this situation. Otherwise, it chooses a random ru ∈ Zp and gives the adversary the −J(u) −1 pair du = (du1 , du2 ) = (g1F (u) (u i∈U ui )ru , g1F (u) g ru ) Let ru = ru − F α(u) , as in Waters’ proof [18] and Paterson’s proof [19] and we will show in the following, du is a valid private key for identity U.

Note that in Setup phase, C assigns g1 = g a and g2 = g b . After C defines functions F (u), J(u), K(m), L(m) and public parameters u , m , ui , mj , we have 26 B. Zhang and Q. Xu F (u) J(u) u ui = g2 g , i∈U K(m) L(m) m mj = g 2 g . j∈M Then, the forger can perform a polynomially bounded number of queries including private key extraction queries, signcryption queries, and unsigncryption queries. The challenger C answers the forger in the same way as that of Theorem 2. Finally, if C does not abort, the forger will return a new ciphertext σ ∗ = (c∗ , σ1∗ , σ2∗ , σ3∗ , σ4∗ , L∗ ) on message m∗ , where m∗ has never been queried.

As we can see from the concrete scheme, the cost is linear with the size of group. It remains an open problem to construct a much more efficient scheme that is secure in the standard model with constant size signcryption ciphertext while removing all limitations on the size of group. References 1. : Digital signcryption or how to achieve cost (signature & encryption) cost (signature)+cost (encryption). S. ) CRYPTO 1997. LNCS, vol. 1294, pp. 165–179. Springer, Heidelberg (1997) 2. : Identity-based cryptosystem and signature scheme.

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