目前自适应安全的多授权机构基于属性的加密(Attribute-Based Encryption ,ABE)方案都是在合数阶群上构造,针对其计算开销较大的问题,利用对偶配对向量空间技术,在素数阶群上构造了一种支持单调的访问结构且自适应安全的多授权机构密文策略 ABE(Multi-Authority Ciphertext Policy ABE ,MA-CP-ABE)方案。在标准模型下将该方案的安全性归约到判定性线性假设。性能分析表明,该方案在达到自适应安全的同时,具有更高的计算效率。
Previous adaptively secure multi-authority attribute-based encryption (ABE)schemes suffered from superfluous computation overhead on composite order groups .To tackle this problem ,an adaptively secure multi-authority ciphertext-policy ABE (MA-CP-ABE)scheme on prime order groups was proposed when a dual pairing vector space approach was employed .The pro-posed scheme supports any monotone access structure ,and is proven adaptively secure from the decisional linear assumption in the standard model .Performance analysis indicates that our scheme is more efficient while achieving the adaptive security .