标准模型下 CCA2安全且固定密文长度的模糊基于身份加密方案

摘要

模糊基于身份加密体制为基于身份密码提供了检错能力，并且可以把消息加密后同时发送给多个具有相同属性的用户。本文提出了一种在标准模型下能抵抗适应性选择密文攻击，并且密文长度达到了固定值的模糊基于身份加密方案。与现有方案相比，本方案占用通信带宽低，计算效率高，具有更高的安全性，因此能更好的满足应用要求。%Fuzzy identity-based encryption can provide an error-tolerance property for identity-based systems ,and it allows a sender to encrypt a message to all users who have a certain set of attributes .In this paper ,we proposed a fuzzy identity-based en-cryption scheme with constant size of ciphertexts that is indistinguishable against adaptive chosen ciphertexts attacks (CCA2 )in the standard model .Compared with other existing schemes ,this construction can satisfy the application requirements ,as it can provide better efficiency in terms of the communication and computation cost as well as a stronger security guarantee .