By Aurélie Bauer, Jean-Sébastien Coron, David Naccache, Mehdi Tibouchi, Damien Vergnaud (auth.), Jianying Zhou, Moti Yung (eds.)
ACNS 2010, the eighth foreign convention on utilized Cryptography and community defense, used to be held in Beijing, China, in the course of June 22-25, 2010. ACNS 2010 introduced jointly members from academia and keen on m- tiple study disciplines of cryptography and safeguard to foster the trade of principles. ACNS used to be initiated in 2003, and there was a gentle development within the caliber of its application over the last eight years: ACNS 2003 (Kunming, China), ACNS 2004 (Yellow Mountain, China), ACNS 2005 (New York, USA), ACNS 2006 (Singapore), ACNS 2007 (Zhuhai, China), ACNS 2008 (New York, USA), ACNS2009(Paris,France). Theaverageacceptanceratehasbeenkeptataround 17%, and the typical variety of members has been stored at round a hundred. The convention got a complete of 178 submissions from worldwide. every one submission used to be assigned to at the least 3 committee individuals. Subm- sions co-authored by way of participants of this system Committee have been assigned to at the very least 4 committee participants. end result of the huge variety of top quality s- missions, the assessment approach was once hard and we're deeply thankful to the committee participants and the exterior reviewers for his or her impressive paintings. - ter broad discussions, this system Committee chosen 32 submissions for presentation within the educational tune, and those are the articles which are integrated during this quantity (LNCS 6123). also, a couple of different submissionswereselected for presentation within the non-archival business track.
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Extra resources for Applied Cryptography and Network Security: 8th International Conference, ACNS 2010, Beijing, China, June 22-25, 2010. Proceedings
Shrinking the Keys of Discrete-Log-Type Lossy Trapdoor Functions 37 In order to take advantage of this redundancy our ﬁrst idea is to use a bilinear group G with generator g. A natural approach is to consider publishing as part of the public key g a1 , . . , g an , g r1 , . . , g rn consisting of only O(n) group elements. Then when evaluating the trapdoor, one can dynamically generate the PW matrix by taking the (i, j)-th element as e(g ri , g aj ). While this ﬁrst technique does indeed compress the matrix, it actually gives the attacker too much information.
4 Future Work and Open Problems The reason why the proposed construction can improve the transmission overload relies on the fact that we utilize the diﬀerence between the points in and outside a certain interval. How to use the diﬀerence between a point in and outside of a graph to reduce the transmission overload, especially to minimize the constant factor k during the multidimensional scenario is left as an important open problem. It is possible to borrow some idea from computational geometry to solve this problem.
To do this we ﬁnd a somewhat surprising connection to the identity-based revocation scheme of Lewko, Sahai, and Waters . In their work, they describe a “two equation” technique for identity-based revocation. 1 Intuitively, we will apply a (high-level) version of this idea, not for revocating IBE users but for compressing an LTDF public key. Conceptually we will map each row i of a ciphertext to a ciphertext that is associated with a “virtual identity” i and each column j with a “virtual key” for identity j.
Applied Cryptography and Network Security: 8th International Conference, ACNS 2010, Beijing, China, June 22-25, 2010. Proceedings by Aurélie Bauer, Jean-Sébastien Coron, David Naccache, Mehdi Tibouchi, Damien Vergnaud (auth.), Jianying Zhou, Moti Yung (eds.)