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Improving the Message-Ciphertext Rate of Lewko's Fully Secure IBE Scheme

机译:提高Lewko的完全安全IBE方案的消息密文速率

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In Eurocrypt 2012, Lewko presented a fully secure IBE scheme in the prime order setting based on the decisional linear assumption. We note that in Lewko's scheme, some random factor involved in the ciphertext can further be used to hide yet another message, and hence get a new fully secure IBE scheme with better message-ciphertext rate. Similar to Lewko's scheme, we use dual pairing vector space in prime order bilinear groups to simulate the canceling and parameter hiding properties of composite order settings. The security of our scheme is based on the subspace assumption, which can be reduced to the decisional linear assumption. We employ the dual system encryption technique in our security proof.
机译:在Eurocrypt 2012中,Lewko基于决策线性假设,在基本订单设置中提出了一种完全安全的IBE方案。我们注意到,在Lewko的方案中,密文中包含的一些随机因素可以进一步用于隐藏另一个消息,从而获得具有更好的消息密文速率的新的完全安全的IBE方案。与Lewko的方案类似,我们在素数阶双线性组中使用双配对向量空间来模拟复合阶数设置的取消和参数隐藏属性。我们方案的安全性基于子空间假设,可以将其简化为决策线性假设。我们在安全性证明中采用了双重系统加密技术。

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