高效完全可验证外包解密属性基加密方案

属性基加密虽然能够很好地保护用户的数据安全，但是用户解密的计算代价随着访问结构的复杂性而线性增加。外包解密技术的提出使得用户只需要很少的开销就能够解密得到明文。然而，外包解密技术是将大量的解密操作交由云服务器来处理，而云服务器通常被认为是半可信的。因此，对云服务器部分解密得到的转换密文进行正确性验证是很有必要的。本文提出一种高效的完全可验证外包解密属性基加密方案，使得授权用户以及非授权用户都能够实现转换密文正确性的验证。 

Attribute-based Encryption Scheme of Efficient Full-verifiable Outsourced Decryption

Attribute-based encryption can protect the security of users data, but the decryption cost grows linearly with the complexity of access policy. Outsourced decryption technology makes the users only need a little overhead to decrypt and obtain the plaintext. However, a large number of decryption operations of outsourced decryption technology are dealt with  by cloud service providers. But the cloud service providers are regarded as semi-trusted (honest but curious). So it is necessary to verify the correctness of outsourced decryption to ensure security for users data. This paper proposes an efficient ABE scheme with full-verifiable outsourced decryption, it makes both the authorized users and unauthorized users can verify the correctness of the transformed ciphertext. 