【摘要】 考虑到动态Ad hoc网的安全性及效率难以兼顾的问题,提出一种有效的基于动态网络的广播加密方案,并给出严格的安全性证明。该方案建立在标准模型下,当用户之间通过广播方式传递信息时,采用双线性对运算对任意数量无状态用户可实现完全抗串谋攻击。在密钥提取过程中,通过引入身份随机数并利用撤销用户身份集合进行加密,使得新用户可以动态加入群却不改变加解密密钥和密文的长度,其大小不超过O(1)。同时,所有有效操作过程在O(r)时间内完成,不依赖于用户总人数m,从而大大提高了算法的传输及存储效率。安全性验证表明,该方案在GD-DHE假设下是抗静态敌手IND-IN-CPA安全的。更多还原

【Abstract】 To give concurrent consideration in the security and efficiency,a novel identity-based broadcast encryption was developed for ad hoc networks.Through security analysis,the correctness and effectiveness of the above methods were verified.Based on the standard model,the bilinear maps were introduced to achieve the collusion-secure for arbi-trarily large of users during the broadcast communication.In the process of extract,new users could join dynamically without modification of user decryption keys nor ciphertext size by using ID,and its size not much than O(1).Simulta-neously,all efficiency measures were completed in O(r) time but not depended on the number of user m,thus the effi-ciency of transmission and storage was improved.Proof of security shows that the proposed scheme is IND-IN-CPA se-cure against static adversaries in the standard model under the(t,n)-GDDHE intractability assumption.更多还原