具有固定密文长度的多授权属性基密钥协商协议

为适应云环境中移动手机等资源限制型设备的使用,降低基于多授权属性基加密的会话密钥协议的计算和通信代价,提出一种能生成固定密文长度交换消息的协议。该协议基于多值访问结构,加强了数据拥有者对系统模型的权限控制;在基于属性的BJM(Blake-Johnson-Menezes)模型和选择访问结构安全模型下,基于判定性q并行双线性Diffie-Hellman指数(q-PBDHE)假设证明了该协议的安全性。通过实验比较分析了类似协议的性能,表明该协议具有较高效率和安全性,适合在轻量级应用场景上使用。

Key agreement protocol with constant ciphertext length based on multi-authority attribute-based encryption

In order to adapt to the use of resource-limited devices such as mobile phones in the cloud environment and reduce the computation and communication cost of the session key protocol based on multi-authority attribute-based encryption,this paper proposed a protocol that generated exchange messages with ciphertexts of constant length.This protocol visited data on the basis of the multi-value access structure,which strengthened the controlling abilities of the data owners over the system.Under attribute-based Blake-Johnson-Menezes(BJM)model and selective access structure security model,the protocol made security proving based on q parallel Diffie-Hellman exponent(q-PBDHE)hypothesis.The experimental results show that the proposed protocol has lower computational and communication costs and is suitable for the application of resource-constrained devices.