标准模型下完全安全且固定密文长度的内积加密方案

Fully Secure Inner Product Encryption Achieving Constant-Size Ciphertexts in the Standard Model

基于对偶对向量空间,构造了一个新的固定密文长度的内积加密方案。新方案利用对偶系统加密技术,在标准模型下基于形式上对称的Diffie-Hellamn假设,证明该方案是完全安全的。与基于线性判定假设构造的内积加密方案相比,新方案占用通信带宽低,计算效率高,能更好的满足应用要求。

This paper presents an efficient inner product encryption （IPE） scheme with constantsize ciphertexts using the dual pairing vector space. The proposed IPE scheme achieves full security by adapting the dual system eneryption methodology introduced by Waters. Security is proven under the Symmetric External Diffie-Hellman （SXDH） assumption in bilinear groups. Compared with those of previous constructions based on Decisional Linear （DL） assumption, the presented construction can provide better efficiency in terms of the communication and computation cost, thus satisfying the application requirements better.