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Improving the trade-off between storage and communication in broadcast encryption schemes

机译:在广播加密方案中改善存储和通信之间的权衡

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The most important point in the design of broadcast encryption schemes (BESs) is to obtain a good trade-off between the amount of secret information that must be stored by every user and the length of the broadcast message, which are measured, respectively, by the information rate rho and the broadcast information rate rho(B). In this paper, we present a simple method to combine two given BESs in order to improve the trade-off between rho and rho(B) by finding BESs with good information rate rho for arbitrarily many different values of the broadcast information rate rho(B). We apply this technique to threshold (R,T)-BESs and we present a method to obtain, for every rational value 1/R less than or equal to rho(B) less than or equal to 1, a (R,T)-BES with optimal information rate rho among all (R,T)-BESs that can be obtained by combining two of the (R,T)-BESs proposed by Blundo et al. (Lecture Notes in Comput. Sci. 1190 (1996) 387-400). (C) 2004 Elsevier B.V. All rights reserved.
机译:广播加密方案(BES)的设计中最重要的一点是,在每个用户必须存储的秘密信息量与广播消息的长度之间进行权衡,后者分别由信息速率rho和广播信息速率rho(B)。在本文中,我们提出了一种简单的方法来组合两个给定的BES,以通过针对广播信息速率rho(B)的许多不同值找到具有良好信息速率rho的BES来改善rho和rho(B)之间的平衡。 )。我们将此技术应用于阈值(R,T)-BESs,并提出一种方法,对于每个小于或等于rho(B)的有理值1 / R小于或等于1,获得(R,T)通过组合Blundo等人提出的两个(R,T)-BES可以获得所有(R,T)-BES中具有最佳信息速率rho的-BES。 (计算机科学1190(1996)387-400中的讲义)。 (C)2004 Elsevier B.V.保留所有权利。

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