基于RSA的广播加密方案

为提高广播加密系统的实用性和效率,通过采用不同模余下的授权用户成员的群密钥分发策略,构造了一个新的基于RSA加密方案的广播加密方案,可以进行安全的群密钥分发,并能够有效地实现无需密钥更新的新成员的动态加入.该方案减少了通信传输带宽以及用户的密钥存储量(仅需一个群元素),并且其加解密的计算代价与RSA加密方案相当.分析了该方案的效率,并在RSA假设下证明了该方案在任意用户的合谋攻击下的安全性.

Broadcast encryption scheme from RSA

To improve practicability and efficiency of the broadcast encryption system,a new broadcast encryption scheme based on RSA encryption scheme is constructed through the exploitation of group key distribution strategy for authorized users under different modulus.It may securely realize group key distribution and ensure dynamic join for new users without any key update computation.Both the communication transmission bandwidth and key storage size of each user in the scheme are greatly reduced(only one group element),while the encryption-decryption computation cost is about the same as RSA scheme.The efficiency of the scheme is analyzed,and the collusion-resistance security proof under the RSA assumption is given as well.