Practical Large Universe Attribute-Set Based Encryption in the Standard Model

Attribute-set based encryption is a promising branch of attribute-based encryption which deals with the case when many attributes are only meaningful in groups or in sets and helps to avoid the exponential growth of attributes. We propose a feasible and efficient attribute-set based encryption scheme which is large universe, unbounded and supports composite attributes, using linear secret sharing schemes as the underlying tool. Additionally, our construction has been proved to be selectively secure in the standard model while previous ones could only be proved to be secure in the generic group model.