@misc{W1510795740,
  author = {Brent Waters},
  title = {Ciphertext-Policy Attribute-Based Encryption: An Expressive, Efficient, and Provably Secure Realization},
  year = {2011},
  howpublished = {Lecture notes in computer science},
  doi = {https://doi.org/10.1007/978-3-642-19379-8\_4}
}