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A Conditional Proxy Broadcast Re-Encryption Scheme Supporting Timed-Release

机译:支持定时发布的条件代理广播重加密方案

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To allow a delegator not only to delegate the keyword-controlled decryption rights of a broadcast encryption to a set of specified recipients, but also to control when the decryption rights will be delegated, in this paper, for the first time, we introduce a new notion called Timed-Release Conditional Proxy Broadcast Re-Encryption (TR-CPBRE). We also propose a concrete construction for TR-CPBRE which can be proven selective identity adaptive CCA secure under the (P, Q, f)-general decisional Diffie-Hellman exponent assumption, and chosen-time period chosen-ciphertext secure under the bilinear Diffie-Hellman assumption. When compared with the existing CPBRE and Timed-Release Proxy Re-Encryption (TR-PRE) schemes, our scheme achieves better efficiency, and enables the delegator to make a fine-grained delegation of decryption rights to multiple delegatees.
机译:为了使委托者不仅可以将广播加密的关键字控制的解密权限委托给一组指定的接收者,而且还可以控制何时将解密权限委托给代理,在本文中,我们首次引入了一种新的方法。称为定时释放条件代理广播重新加密(TR-CPBRE)的概念。我们还提出了TR-CPBRE的具体结构,在(P,Q,f)通用决策Diffie-Hellman指数假设下,可以证明选择身份自适应CCA是安全的;在双线性Diffie下,可以选择时间段选择密文。 -Hellman的假设。与现有的CPBRE和定时释放代理重新加密(TR-PRE)方案相比,我们的方案实现了更高的效率,并使委托者可以将解密权限精细地委派给多个委托人。

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