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Efficient Anonymous Identity-Based Broadcast Encryption without Random Oracles

机译:无随机Oracle的高效基于匿名身份的广播加密

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摘要

Broadcast encryption provides a method of secure multi-receiver communications, where a broadcaster can encrypt a message for a set S of users who are listening to a broadcast channel. Most identity-based broadcast encryption (IBBE) schemes are not anonymous, which means the attacker can obtain the identities of all receivers from the ciphertext. In this paper, the authors propose an efficient anonymous IBBE scheme in bilinear groups of prime order, where any attacker cannot get the identities of the receivers from the ciphertext. The scheme has constant size ciphertext and achieves adaptive security based on the asymmetric decisional bilinear Diffie-Hellman Exponent (DBDHE) assumption without random oracles. The proposed scheme improves efficiency and security of anonymous IBBE schemes simultaneously.
机译:广播加密提供了一种安全的多接收者通信的方法,其中广播者可以为正在收听广播频道的一组用户S加密消息。大多数基于身份的广播加密(IBBE)方案都不是匿名的,这意味着攻击者可以从密文中获取所有接收者的身份。在本文中,作者在素数双线性组中提出了一种有效的匿名IBBE方案,其中任何攻击者都无法从密文中获得接收者的身份。该方案具有恒定大小的密文,并基于非对称决策双线性Diffie-Hellman指数(DBDHE)假设而获得了自适应安全性,而没有随机预言。所提出的方案同时提高了匿名IBBE方案的效率和安全性。

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