Identity-based Broadcast Encryption Based on Ad hoc Networks
基于Ad hoc网的身份型广播加密方案

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 arbitrarily 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). Simultancously, all efficiency measures were completed in O(r) time but not depended on the number of user m, thus the efficiency of transmission and storage was improved. Proof of security shows that the proposed scheme is IN-IN-CPA secure against static adversaries in the standard model under the (t,n)-GDDHE intractability assumption.